Journal articles: 'Chemical soil characteristics'

1

Růžek, L., K. Voříšek, J. Vráblíková, S. Strnadová, and P. Vráblík. "Chemical and biological characteristics of reclaimed soils in the Most ŕegion (Czecg Reooublic)." Plant, Soil and Environment 49, No. 8 (December 10, 2011): 346–51. http://dx.doi.org/10.17221/4135-pse.

Full text

Abstract:

Soil organic carbon content [Corg], pHH2O, pHKCl and microbiological characteristics (microbial biomass carbon [CMB], extracellular microbial carbon [CEX], respiration, ammonification, and nitrification) were studied in 11 reclaimed soils, where the technical reclamation was carried out by Most Coal Mining Company in the year 2000 or 2001. These soils were immediately sown with legumes and grasses. Corg content in soil was rather wide ranging between 0.15–4.82%. The lowest value was determined in loess applied in the year 2001 at the locality No. 6 Mine Most, and the highest one at the locality No. 5 Mine Most amended with pulp wastes and sewage sludge (400 t and 200 t per hectare, respectively). pHKCl was in the range: 5.1–7.4. Six indicators of microbial status and metabolic activity of living micro-organisms, were used for the evaluation of the reclamation technology, i.e. (1) μg CMB/g dry soil, (2) μg CEX/mg CMB, (3) ratio CMB/Corg in per cent (4), potential respiration with glucose, (5) potential ammonification with peptone, (6) potential nitrification with (NH4)2SO4. The best results were found in the locality No. 5 Mine Most (reclaimed in 2000) amended with pulp wastes and sewage sludge (400 t and 200 t per hectare, respectively). The lowest values characterised the locality No. 1 Mine Slatenice (reclaimed in 2000) with a high content of coal powder and the lowest pHKCl (5.1). The use of mycorrhizal inoculum SYMBIVIT resulted in a high biological activity in the locality No. 11 Mine ___ that was the best among soils reclaimed in 2001.

APA, Harvard, Vancouver, ISO, and other styles

2

Aziz, Muhammad Abdul, Fahrizal Hazra, Selly Salma, and Dedi Nursyamsi Nursyamsi. "Soil Chemical Characteristics of Organic and Conventional Agriculture." JOURNAL OF TROPICAL SOILS 21, no. 1 (January 3, 2017): 19. http://dx.doi.org/10.5400/jts.2016.v21i1.19-25.

Full text

Abstract:

Use of chemical fertilizers and pesticides on intensive land of both lowland and upland food crops have been shown to increase agricultural productivity significantly. Research aimed to study soil chemical characteristics and soil pesticide residues at some crops of organic and conventional farms. The research was carried out in Laboratory of Soil Chemistry, Indonesian Soil Research Institute and in Laboratory of Agrochemical Residue, Indonesian Agricultural Environment Research Institute, Bogor from February to July 2015. Soil samples at 0-10 cm depth were taken compositely from broccoli (Brassica oleracea), carrots (Daucus carota), maize (Zea mays), and tomatoes (Solanum lycopersicum) farms in Bogor Regency as well as from rice field in Tasikmalaya Regency at both organic and conventional farms. Soil chemical characteristics were analyzed include: soil organic-C (Walkey and Black), total-N (Kjeldahl), potential-P (HCl 25%), available-P (Olsen), potential-K (HCl 25%), available-K (NH4OAc 1 N pH 7), CEC (NH4OAc 1 N pH 7), and pH (soil : water = 1: 5), while pesticide residues included levels of organochlorine (lindane, aldrin, heptaklor, dieldrin, DDT, endosulfan); organophosphates (diazinon, fenitrotin, metidation, paration, profenofos); and carbamates (carbofuran, MIPC, BPMC) in the soil by using Gas Chromatography method. Results showed that levels of soil organic-C, total-N, potential and available-P, potential and available-K, CEC, pH at organic farms were higher than those at conventional farms. Some pesticide residues compound (organochlorines, organophosphates, and carbamates) were detected at conventional farm, while those at organic farm were not detected (trace).Keywords: Conventional farm, organic farm, pesticide residues, soil properties. [How to Cite: Muhammad AA, F Hazra, S Salma and D Nursyamsi. 2016. Soil Chemical Characteristics of Organic and Conventional Agriculture. J Trop Soils 21: 19-25. Doi: 10.5400/jts.2016.21.1.19]

APA, Harvard, Vancouver, ISO, and other styles

3

Lee, Gil-Seong, and Yeon-Sik Choo. "Physical and Chemical Characteristics of Dokdo Soil." Journal of Ecology and Environment 32, no. 4 (November 30, 2009): 295–304. http://dx.doi.org/10.5141/jefb.2009.32.4.295.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

FERNANDEZ, I. J., and R. A. STRUCHTEMEYER. "CHEMICAL CHARACTERISTICS OF SOILS UNDER SPRUCE-FIR FORESTS IN EASTERN MAINE." Canadian Journal of Soil Science 65, no. 1 (February 1, 1985): 61–69. http://dx.doi.org/10.4141/cjss85-007.

Full text

Abstract:

Soils supporting even-aged spruce-fir stands in eastern Maine are highly acid with soil pH often found to be a useful indicator of potential tree growth. This investigation examined the chemical characteristics of these soils at 22 spruce-fir sites and the relationship between soil chemical properties and site productivity. Each major soil horizon exhibited a distinctly different chemical environment. Spruce-fir site productivity was found to be significantly correlated with B horizon organic-P, O horizon pH, and the total organic matter content of the mineral soil horizons. Soil pH increased with depth in the profile ranging from a mean value of 3.13 in the O horizon (i.e. F + H) to 4.91 in the C horizon. Significant correlations were exhibited between pH and exchangeable Ca, exchangeable Al, and extractable Al throughout the profile. Fractionation of P in the B horizons demonstrated that occluded-P was the most concentrated of the fractions measured, with the order of relative abundance for the P fractions being occluded-P > Al-P > organic-P > Fe-P > Ca-P > extractable-P. Sampling of soils for evaluating the potential for forest growth in this region must be carried out by horizons, as these differ remarkably with respect to those variables that have been shown to have an influence on tree growth. Key words: pH, site quality, organic matter, phosphorus, aluminum, spruce-fir

APA, Harvard, Vancouver, ISO, and other styles

5

Uematsu, Shinichiro, Erik Smolders, Lieve Sweeck, Jean Wannijn, May Van Hees, and Hildegarde Vandenhove. "Predicting radiocaesium sorption characteristics with soil chemical properties for Japanese soils." Science of The Total Environment 524-525 (August 2015): 148–56. http://dx.doi.org/10.1016/j.scitotenv.2015.04.028.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Manrique, L. A., C. A. Jones, and P. T. Dyke. "Predicting soil water retention characteristics from soil physical and chemical properties." Communications in Soil Science and Plant Analysis 22, no. 17-18 (November 1991): 1847–60. http://dx.doi.org/10.1080/00103629109368540.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Svoboda, M. "Biological activity, nitrogen dynamics, and chemical characteristics of forest soils in the Šumava national park." Journal of Forest Science 49, No. 7 (January 16, 2012): 302–12. http://dx.doi.org/10.17221/4704-jfs.

Full text

Abstract:

This paper deals with large-scale mountain forest decline in the &Scaron;umava National Park. The changes in biotic and abiotic properties of forest sites follow the tree layer disintegration. Changed microclimatic conditions such as intensity of irradiance, moisture and temperature of the top holorganic layers together with altered development of ground vegetation could strongly affect the values of microbiological respiration activity and the rates of nitrogen mineralization and nitrification. Soil substrates, built of organic mater, located on stony locations, are endangered by introskeletal erosion. This paper compares these features in pairs of research plots, consisting of dead or cut forest and of living stand. According to the results of this study, higher rates of organic matter decomposition, transformed dynamics of nitrogen and other nutrients and possible nutrient leaching from soil solutions were demonstrated in the forest floor under declined spruce stands. The extent and seriousness of these adverse processes for forest soils are strongly site dependent.

APA, Harvard, Vancouver, ISO, and other styles

8

Webster, E. A., E. L. Tilston, J. A. Chudek, and D. W. Hopkins. "Decomposition in soil and chemical characteristics of pollen." European Journal of Soil Science 59, no. 3 (June 2008): 551–58. http://dx.doi.org/10.1111/j.1365-2389.2008.01022.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Turner, John, and Joseph Kelly. "Effect of radiata pine on soil chemical characteristics." Forest Ecology and Management 11, no. 4 (August 1985): 257–70. http://dx.doi.org/10.1016/0378-1127(85)90104-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Inderjit and K. M. M. Dakshini. "Allelopathic effect of cyanobacterial inoculum on soil characteristics and cereal growth." Canadian Journal of Botany 75, no. 8 (August 1, 1997): 1267–72. http://dx.doi.org/10.1139/b97-841.

Full text

Abstract:

Allelopathic effects of cyanobacterial inoculum on soil characteristics and cereal growth were investigated. Research established the alteration of chemical characteristics of the soils inoculated with different concentrations of cyanobacterial inoculum. Inoculated soils, compared with uninoculated soils, sometimes had significantly different values for chemical characteristics such as pH, electrical conductivity, organic matter, organic N, total phenolics, and exchangeable cations such as Cu, Zn, Na, K, Mg, and Ca as the level of inoculum increased. Despite a significant increase in organic nitrogen in the inoculated soils, root growth of rice and wheat was suppressed. The total phenolic content of inoculated soils increased in proportion to the concentration of inoculum added and the suppression of root growth. It is, therefore, suggested that prior to formulating and recommending cyanobacterial inocula as biofertilizers, their allelopathic aspects should be studied to determine a soil to algae ratio having minimum (least altered) chemical characteristics and nonsignificant allelopathic influences on each other. Key words: allelopathy, cyanobacterial inoculum, organic N, phenolics, rice.

APA, Harvard, Vancouver, ISO, and other styles

11

Li, Yan Mei, Xiao Yong Zhou, and Jun Yang. "Investigation on Soil Physiochemical Properties and Heavy Metal Contamination Characteristics in Two Types of Sites." Applied Mechanics and Materials 665 (October 2014): 547–50. http://dx.doi.org/10.4028/www.scientific.net/amm.665.547.

Full text

Abstract:

We investigated soil physiochemical properties and heavy metal contamination characteristics in steel and chemical sites, aimed to provide theoretical basis for future site remediation. Results indicated that: soils in both sites showed sandy and alkaline trend. Soil total phosphorus, total potassium, and available nitrogen content in steel site, and total and available nitrogen, phosphorus and potassium content in chemical site were lower than that in farmland soil. Soil lead and zinc contamination in steel site and soil arsenic contamination in chemical site should be given priority in remediation. In addition, cadmium and arsenic risk in steel site and mercury risk in chemical site should also be paid sufficient attention.

APA, Harvard, Vancouver, ISO, and other styles

12

Águas, Murilo Alceu de, Joaquim José Frazão, Leonardo Mariano do Nascimento, João Paulo Souza Carneiro, Ariel Muncio Compagnon, Ana Paula Santos Oliveira, Valter Dos Santos Marques, Vagner Alves da Silva, and Roriz Luciano Machado. "Spatialization of Granulometric and Chemical Characteristics in Irrigated Hydromorphic Soil." Journal of Agricultural Studies 9, no. 3 (August 8, 2021): 153. http://dx.doi.org/10.5296/jas.v9i3.18802.

Full text

Abstract:

Lowlands represent a significant portion of agricultural areas in the world. Thus, understanding the spatial variability of the chemical and granulometric characteristics of hydromorphic soils can contribute to improving soil management and fertility. The objective of this work was to characterize spatial dependence, spatialized chemical attributes, granulometry, and the ideal number of samples in irrigated hydromorphic soil. Soil sampling was conducted in a grid of 10x10 m, in the layers of 0–0.1 and 0.1–0.2 m, totalling 432 composite samples. The evaluated attributes are as follows: pH in water, H+Al, SOM, Ca, Mg, Al, P, K, CTC, V%, Cu, Fe, Zn, Mn, clay, silt, and sand. The texture of the area was classified as loamy–sandy and free in the 0–0.1 and 0.1–0.2 m layers, respectively. The coefficient of variation of the attributes ranged from 2.71% (0–0.1m) to 149.07% (0.1–0.2m). All the attributes studied exhibited moderate to strong spatial dependence. The sample grid with a sampling interval of 20 m referring to the 0–0.1 m layer proved to be adequate. The ideal number of simple samples per composite is 19 for granulometry and macronutrients, and 28 for the micronutrients in the 0–0.1 m layer.

APA, Harvard, Vancouver, ISO, and other styles

13

Sunil, B. M., S. Shrihari, and Sitaram Nayak. "Shear strength characteristics and chemical characteristics of leachate-contaminated lateritic soil." Engineering Geology 106, no. 1-2 (May 2009): 20–25. http://dx.doi.org/10.1016/j.enggeo.2008.12.011.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Sapkota, Ramesh P., Peter D. Stahl, and Kedar Rijal. "Physicochemical characteristics of forest soils in Tarai and Siwalik regions of Nepal." Nepal Journal of Environmental Science 5 (December 4, 2017): 27–33. http://dx.doi.org/10.3126/njes.v5i0.22712.

Full text

Abstract:

Soils are important components of every terrestrial ecosystem. In Nepal, terrestrial ecosystems of Tarai and Siwalik regions are highly vulnerable due to intense anthropogenic disturbances. Forest depletion and land degradation have posed substantial impacts on soil quality. This review paper focuses on identifying the status of physical and chemical characteristics of forest soils in Tarai and Siwalik regions. For the purpose, published articles from various sources, as well as publications of Government of Nepal were reviewed. The study showed variation in physicochemical characteristics of soils in different regions. The land areas covered with vegetation were found effective in controlling erosion and consequently retention of important chemical properties of soils. The scientific studies on soil physical, chemical and biological quality seem inadequate. Standard research framework and sampling designs are required in future studies, so that comparisons on soil properties across different degraded and/or other land-use categories can be made. There is need of development of scientific database on soil quality for supporting future ecosystem management and restoration programs.

APA, Harvard, Vancouver, ISO, and other styles

15

McANDREW, D. W., and S. S. MALHI. "LONG-TERM EFFECT OF DEEP PLOWING SOLONETZIC SOIL ON CHEMICAL CHARACTERISTICS AND CROP YIELD." Canadian Journal of Soil Science 70, no. 4 (November 1, 1990): 565–70. http://dx.doi.org/10.4141/cjss90-059.

Full text

Abstract:

Deep plowing (DP) has been investigated as a possible ameliorative procedure for Solonetzic soils, but the long-term effects of DP on soil properties are not known. Soil sampling to determine the long-lasting effects of DP on some soil chemical properties and crop yields was conducted at four sites with Solonetzic soils in east-central Alberta. The soils had been deep plowed 11–29 yr prior to sampling. Compared to adjacent unplowed (check) treatments, DP resulted in significant improvements in soil chemical properties at most of the sites. The sodium adsorption ratio (SAR) of the AB horizon (12- or 15- to 30-cm depth) was lower after DP at all four sites. Extractable and soluble Ca increased in the Ap horizon (0–12 cm) of DP soils, whereas extractable Na decreased in the Ap or AB horizons at three sites. The pH of the Ap horizon increased from acidic to neutral at three sites, while EC of the Ap horizon decreased at two sites. Crop yield increased due to DP at the three sites where yields were measured. The results indicate a long-term amelioration of Solonetzic soils by DP. Key words: Amelioration, deep plowing, deep tillage, sodic soil

APA, Harvard, Vancouver, ISO, and other styles

16

Yang, S. J., Z. Y. Du, Y. Yu, Z. L. Zhang, X. Y. Sun, and S. J. Xing. "Effects of root pruning on physico-chemical characteristics and biological properties of winter jujube rhizosphere soil." Plant, Soil and Environment 57, No. 11 (November 8, 2011): 493–98. http://dx.doi.org/10.17221/38/2011-pse.

Full text

Abstract:

The root system of six-year-old winter jujube (Zizyphus jujuba Mill. cv. Zhanhua) trees were manually pruned at 3, 5 or 7 times trunk diameter distance along both inter-row sides, to study the effects of root pruning on physico-chemical characteristics and biological properties of winter jujube rhizosphere soil. The results showed that the root pruning of 3 and 5 times trunk diameter distance increased the available nitrogen, phosphorus, potassium[concentrations and pH values in the rhizosphere soil and decreased organic matter concentrations, the contents of amino acids, organic acids and total sugars in the root exudates, the populations of bacteria, actinomyces and fungi, and inhibited the activities of catalase, invertase and urease enzymes in contrast to the control in early stage when root pruning was applied. The determined indexes presented a reverse trend as those in early stage after new roots appeared. Compared to the control, the trees by root pruning had higher pesticides residues of the rhizosphere soil in the whole experiment. No differences were noticed between 7 times trunk diameter distance and the control. It is proposed that root pruning had greater impacts on physico-chemical characteristics and biological properties of the rhizosphere soil depending on root pruning intensity.

APA, Harvard, Vancouver, ISO, and other styles

17

Linares, Rubén, Mario de la Fuente, Pedro Junquera, José Ramón Lissarrague, and Pilar Baeza. "Effects of soil management in vineyard on soil physical and chemical characteristics." BIO Web of Conferences 3 (2014): 01008. http://dx.doi.org/10.1051/bioconf/20140301008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Gimsing, Anne Louise, Ole Kragholm Borggaard, Ole Stig Jacobsen, Jens Aamand, and Jan Sørensen. "Chemical and microbiological soil characteristics controlling glyphosate mineralisation in Danish surface soils." Applied Soil Ecology 27, no. 3 (November 2004): 233–42. http://dx.doi.org/10.1016/j.apsoil.2004.05.007.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Yakovchenko, M., and A. Kosolapova. "Reproduction of soil fertility: research of physical and chemical characteristics of soils." IOP Conference Series: Earth and Environmental Science 403 (December 19, 2019): 012036. http://dx.doi.org/10.1088/1755-1315/403/1/012036.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Silva Neto, Luís de França da, Alberto Vasconcellos Inda, Paulo César Do Nascimento, Elvio Giasson, Catiline Schmitt, and Nilton Curi. "CHARACTERIZATION AND CLASSIFICATION OF FLOODPLAIN SOILS IN THE PORTO ALEGRE METROPOLITAN REGION, RS, BRAZIL." Ciência e Agrotecnologia 39, no. 5 (October 2015): 423–34. http://dx.doi.org/10.1590/s1413-70542015000500001.

Full text

Abstract:

ABSTRACTIn the Porto Alegre metropolitan region (PAMR) there are a significant proportion of floodplain soils, mainly Planosols and Gleysols, in relation to upland soils. This study aimed to evaluate the morphological, chemical and physical characteristics, and to classify floodplain soils in the PAMR. Six soil profiles were evaluated under different sedimentary lithologies and drainage classes, and samples were collected for chemical and physical analyzes. Two orders of mineral soils (Planosols and Gleysols) and one order of organic soil (Organosols) were identified. The soils were moderately deep to deep and stratified. In mineral soils hue ranged between 7.5YR and 2.5Y, with the occurrence of Bg, Btg or Cg gley horizons, while in organic soil the colors were neutral. Sand and silt were the predominant particle sizes according to the origin sedimentary deposits. The organic carbon content was negatively related to soil density and positively related to soil specific surface area and with soil cation exchange capacity. Soil chemical characterization showed expressive variation in bases, aluminum and sodium saturation. Ki index and Fe(CBD)/Fe(H2SO4) ratio indicated a low soil weathering degree. The different sedimentary lithologies and the soil hydromorphism degree were the main factors related to differences in morphological, physical and chemical characteristics of soils in the PAMR.

APA, Harvard, Vancouver, ISO, and other styles

21

Zhou, Ting, Jian Mei Zhou, Li Ming Zhou, Wen Li Zhang, Li Juan You, Xin Ming Wang, and Jia Yin Cao. "Conversion and Species Distribution Characteristics of Arsenical Chemical Agent in the Soil Contaminated by Chemical Weapons Abandoned by Japan." Advanced Materials Research 955-959 (June 2014): 1194–203. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.1194.

Full text

Abstract:

In order to phytoremediation the soils contaminated by arsenical chemical weapons abandoned by Japan at some region of Jilin Province and ready for the estimate of the ecological safety, this paper analyzed organic species in soil with GC-MS, disscussed extraction and testing of inorganic arsenic in soil with hydrochloric acid, studied species of arsenic in soil such as available forms, valence state, and combined state, and inferred conversion process of arsenical chemical agent. The results indicate that after simple destroying and long time burial, almost all arsenical chemical agents in soil at this region are converted into inorganic arsenic due to explosion, burning, natural oxidation and microorganism, which primarily exists as As (V). Organic arsenic was only detected at where shells were buried (destroyed), in leaded shells and contaminated soil, with its content 3.65%~32.03%; Organic arsenic content of soil in other part is less than 10%. In contaminated soil of this region, water soluble arsenic and available arsenic extracted from disodium hydrogen phosphate take 0.81~2.58% and 7.49~15.96% of total arsenic respectively. Exchangeable As and binding As (Al-As, Fe-As, reducible As and Ca-As) take 40% of total arsenic, residual As takes 49.38~66.43%. The results may be used as basis for determining remedy methods and assessing ecological safety at this region.

APA, Harvard, Vancouver, ISO, and other styles

22

Yulnafatmaawita, Ita. "CHARACTERISTICS OF MECHANICALLY FRACTIONATED AGGREGATES OF TWO CONTRASTING SOILS." Jurnal Solum 9, no. 1 (March 23, 2014): 1. http://dx.doi.org/10.25077/js.1.1.1-8.2004.

Full text

Abstract:

Tillage often decreases physical condition of agricultural land, especially aggregate degradation which causes land and environmental quality decreased. As aggregates disperse into single particles, chemical properties of the soil could change. The objective of this research was to study whether or not mechanical fractionation causes soil dispersion indicating by different chemical properties. Aggregates of two soils, Vertisol and Oxisol, were degraded by using puddler at 3 different energy rates (40, 60, and 150 J kg-1 soil minute-1) and then were separated into 3 different sizes (2000-20, 20-2, <2 um). Therefore, each soil sample would have 15 soil separates at different energy and aggregate size. The result showed that aggregate fractionation especially the fraction size, in general, affected EC, ESP, and CEC but not pH of both soils. The pattern of EC and CEC values seemed to be equal, the highest values were found at the smallest aggregate size (< 2 um). The CEC values of Oxisols did not affected by fractionation, while CEC values of Vertisols increased by decreasing aggregate size, and decreased by increasing energy applied. This indicated that Vertisol is easier to disperse than Oxisol.

APA, Harvard, Vancouver, ISO, and other styles

23

Chen, Xiao Yang, Jia Ping Yan, and Xiu Fang Yang. "Physio-Chemical Properties and Hydraulic Characteristics of Reconstruction Soil Filling with Fly Ash." Advanced Materials Research 356-360 (October 2011): 2669–72. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.2669.

Full text

Abstract:

Abstract. Efficient full use of fly ash is still an important issue which has been troubled by the developing countries like China, and a large area subsidence as a result of coal mining also give rise to serious damage for agricultural soils. The agricultural soil profile reconstruction is great significance with fly ash as a substrate because of combining the two problems. In this paper, the feasibility of soil reconstruction is discussed through studying the physio-chemical properties and hydraulic characteristics of fly ash. The results show that the physio-chemical properties of fly ash layer in reconstruction soil profile tend to healthy development with rehabilitation time increasing. Though fly ash layer has a higher water content and poor ability of water vertical upward movement compared to surface soil, but the parameters values are basically appropriate to crop production and not evidently decreasing yields. As for potential groundwater pollution due to solute downward transport of reconstruction soil, we will start further research and draw up solution.

APA, Harvard, Vancouver, ISO, and other styles

24

Misra, Anil. "Stabilization Characteristics of Clays Using Class C Fly Ash." Transportation Research Record: Journal of the Transportation Research Board 1611, no. 1 (January 1998): 46–54. http://dx.doi.org/10.3141/1611-06.

Full text

Abstract:

Coal-burning utilities using subbituminous coal from Wyoming typically produce fly ash, which, because of its high calcium oxide content, may be classified as Class C fly ash. These ashes are characterized by their self-cementing property and therefore can be used for soil improvement. Stabilization characteristics of clay soils blended with Class C fly ash were evaluated. Because fly ash is a by-product, uniformity of its physical and chemical properties is significant for quality control. The statistical characteristics of fly ash physical and chemical properties are obtained and compared with the data in literature. Fly ash is blended with several different clay soils of varying plasticity to study moisture-density relationships and strength behavior of stabilized soils. It is observed that the fly ash used in these experiments has a rapid hydration characteristic. Consequently, higher densities and strengths are achieved when the compaction is performed with little or no delay after the addition of moisture to clay-fly ash blends. Conversely, delayed compaction produces low densities and strength. In addition, it is observed that the stabilization characteristics are closely related to the soil mineral type and plasticity. Results also are presented for strength gain behavior with curing period for the various soil-fly ash blends.

APA, Harvard, Vancouver, ISO, and other styles

25

Moraetis, Daniel, Nikolaos Lydakis-Simantiris, Despina Pentari, Emmanouil Manoutsoglou, Chryssa Apostolaki, and Vasilios Perdikatsis. "Chemical and Physical Characteristics in Uncultivated Soils with Different Lithology in Semiarid Mediterranean Clima." Applied and Environmental Soil Science 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/3590548.

Full text

Abstract:

The aim of this study is to identify the chemical and physical characteristics in uncultivated soils derived from different parent materials under semiarid Mediterranean climatic conditions which favoured the formation of fragile soils. The current work is of great interest in the agriculture and environmental stakeholders for providing a “benchmark” of undisturbed soil quality regarding organic content and nutrients availability. Principal Component Analysis (PCA) was used as the primary tool to demonstrate the soil quality stage, regarding nutrient availability. The statistical analysis revealed that one of the major physicochemical characteristics such as cation exchange capacity (CEC) is controlled exclusively from mineralogy and not from organic matter. Mineralogy and bulk chemical analysis is directly related to soil parent material lithology. The availability of inorganic nutrients (macro- and micronutrients) is low and relatively identical to most of the soils. PCA shows the unusual correlation of K+with not only illite content but also the OM in soils. The development of soils which are already of low quality in respect of organic content and nutrients is evident in Crete in most of the 54 samples investigated.

APA, Harvard, Vancouver, ISO, and other styles

26

T. M. Zobeck and D. W. Fryrear. "Chemical and Physical Characteristics of Windblown Sediment II. Chemical Characteristics and Total Soil and Nutrient Discharge." Transactions of the ASAE 29, no. 4 (1986): 1037–41. http://dx.doi.org/10.13031/2013.30266.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Thomas, BinoyT, SaranyaMolS T, Reshma Rajan, and BhagyaM V. "COMPARATIVE EVALUATION OF PHYSICO-CHEMICAL CHARACTERISTICS OF LATERITE SOIL." International Journal of Advanced Research 5, no. 6 (June 30, 2017): 1748–53. http://dx.doi.org/10.21474/ijar01/4597.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Asubiojo, O. I., and F. M. Adebiyi. "Effects of Bitumen Deposit on Soil Physico-Chemical Characteristics." Soil and Sediment Contamination: An International Journal 20, no. 2 (February 28, 2011): 142–62. http://dx.doi.org/10.1080/15320383.2011.546441.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Ahmed, Ahmed S. F., and Vijaya Raghavan. "Influence of wood-derived biochar on the physico-mechanical and chemical characteristics of agricultural soils." International Agrophysics 32, no. 1 (January 1, 2018): 1–10. http://dx.doi.org/10.1515/intag-2016-0094.

Full text

Abstract:

AbstractAmendment of soil with biochar has been shown to enhance fertility and increase crop productivity, but the specific influence of biochar on soil workability remains unclear. Select physico-mechanical and chemical properties of clay loam and sandy loam soils were measured after amendment with wood-derived biochar of two particle size ranges (0.5-425 and 425-850 µm) at five dosages ranging from 0.5 to 10% dry weight. Whereas the clay loam soil workability decreased when the finer wood-derived biochar was applied at rates of 6 or 10%, soil fertility was not enhanced. The sandy loam soil, due to Proctor compaction, significantly decreased in bulk density with 6 and 10% wood-derived biochar amendments indicating higher soil resistance to compaction.

APA, Harvard, Vancouver, ISO, and other styles

30

Karpenko, F. S. "Physico-chemical nature of clayey soils strength." Геоэкология. Инженерная геология. Гидрогеология. Геокриология, no. 5 (September 20, 2019): 48–60. http://dx.doi.org/10.31857/s0869-78092019548-60.

Full text

Abstract:

The principles of soil mechanics based on Mohr–Coulomb strength theory and Terzaghi effective stresses theory give us the idea about the nature of clay strength. However, these theories consider the clay as a solid body and do not take into account their internal structure. In the present paper, the problems in determining the strength of clayey soils are considered from the standpoint of the physicochemical theory of effective stresses. This theory is based on the ideas of the internal structure of clays. The main idea implies that the structure of clays depends on the contacts formed between mineral particles, where the external stresses transmitted to the soil are concentrating. Water in clayey soils not only fills the pore space but also interacts with the mineral particles forming hydrate films around them. The prevailing type of structural contacts in clays determines the properties of latter. Strength is an intrinsic property of soil determined by its composition and internal structure, independent of the conditions of load application to it and characterized by the actual effective strength value. The value of actual effective strength in clays is determined by the total strength of individual contacts. This is the maximal stress transferred to the soil contacts, the structure being ruined upon exceeding this value. The actual effective strength in soils with the same predominant type of contacts depends on the number of contacts. The numerical strength characteristics of contact types are determined for different clay soil varieties to characterize the actual effective strength. The parameters of relationship between the actual effective strength in clays and their strength characteristics are obtained from the soil testing by standard methods.

APA, Harvard, Vancouver, ISO, and other styles

31

Farias, Phâmella Kalliny Pereira, Carolina Malala Martins Souza, Jeane Cruz Portela, Isadora Nayara Bandeira Medeiros de Moura, and Ana Carla Rodrigues da Silva. "GENESIS AND CHARACTERISTICS OF SOILS OF THE SANTANAMOUNTAIN RANGE IN THE SERIDÓ REGION, RIO GRANDE DO NORTE, BRAZIL." Revista Caatinga 31, no. 4 (December 2018): 1017–26. http://dx.doi.org/10.1590/1983-21252018v31n425rc.

Full text

Abstract:

ABSTRACT Rio Grande do Norte has mountain formations with edaphoclimatic conditions different from those predominating in the state, presenting deeper,acid soils, and milder climate. Among these formations, is the Santana mountain range, which is part of the Serra do Martins Formation. The objective of this work was to interpret the pedogenesis of the representative soils of the Santana mountain range through morphological, physical, and chemical characterizations of soil profiles and evaluate the effect of these attributes on the distribution of pedological forms along the landscape using multivariate analysis. Morphological, physical, and chemical analyses of seven soil profiles of the Santana mountain range were performed. The soils were classified according to the Brazilian Soil Classification System and the data subjected to multivariate analysis. The representative soil classes found were: LATOSSOLO AMARELO Distrófico argissólico; LATOSSOLO AMARELO Eutrófico argissólico; NEOSSOLO QUARTZARÊNICO Órtico típico; NEOSSOLO LITÓLICO Eutrófico fragmentário; NEOSSOLO REGOLÍTICO Eutrófico típico and CAMBISSOLO HÁPLICO Tb Eutrófico léptico. According to the analysis of the morphological attributes, the parent material had great influence on the formation of the different soil classes found in the Santana mountain range. The soil textural classes varied from sand to sandy clay loam. According to the analysis of the chemical attributes, the soil profiles presented acid reaction, great variation of base saturation, and low electrical conductivity. The multivariate analysis established groups of representative soil profiles of the Santana mountain range through the distinction of their physical and chemical attributes, mainly of subsurface diagnostic horizons.

APA, Harvard, Vancouver, ISO, and other styles

32

H. Prasetyo, B. "MINERALOGICAL AND CHEMICAL CHARACTERISTICS OF SPODOSOLS IN TOBA HIGHLAND, NORTH SUMATRA." Indonesian Journal of Agricultural Science 10, no. 2 (October 25, 2016): 54. http://dx.doi.org/10.21082/ijas.v10n2.2009.54-64.

Full text

Abstract:

Spodosols are problem soils due to coarse texture, acid soil reaction, low nutrient status, and low soil moisture retention. About 2.16 million ha of Spodosols (1.1% of the Indonesian land areas) distributed in lowland and highland areas in Kalimantan, Sumatra, Sulawesi, and Papua. Spodosols of the Toba highland areas require special attention because these forested lands are gradually cleared, but then abandoned because they are not suitable for agricultural development, causing land degradation. This study aimed to evaluate mineralogical and chemical characteristics of Toba highland Spodosols, North Sumatra, and their implication on agricultural development. Three pedons of the Toba highland Spodosols from Humbang Hasundutan regency were studied, consisted of soils developed from volcanic sand overlying liparite tuff under the influence of low temperature and high rainfall. Field observation was conducted in January 2008. Fifteen soil samples were collected from the three pedons based on the depth of soil horizon. Results indicated that the formation of these Spodosols were influenced by parent material, high elevation (1676-1821 m) above sea level), and by high amount of rainfall (2167 mm). The Spodosols in Toba highland were still in the early stage of development as characterized by shallow effective soil depth (22-23 cm), domination of weatherable minerals (39-81%) in the sand fraction and dominated by amorphous mineral as shown by sum of A1 + 1/2 Fe extracted by ammonium oxalate as much as 0.6-12.8%. The Spodosols were also characterized by coarse texture (66-95% sand fraction in E and B horizons), high organic-C content (1.4-37.7%), acid soil reaction (pH 3.7- 5.3), very high K2O in Oa horizon (552-933 mg kg-1) and B spodic or C horizon (812-2028 mg kg-1), and low base saturation (< 5%). The existence of biological processes in the surface layer was indicated by accumulation of exchangeable bases (0.88-1.14 cmolc kg-1 in Oa horizon and 0.09-0.25 cmolc kg-1 in B horizon), P2O5 (181-298 mg kg-1 in Oa horizon and 3-24 mg kg-1 in E horizon), and K2O (552-933 mg kg-1 in Oa horizon and 13- 30 mg kg-1 in E horizon). However, these nutrients were easily leached after deforestation. With the sandy texture, loose structure, and no vegetation cover, the erosion hazard is high in the deforested areas. Therefore, lands with Spodosols of the Toba highland, especially are not recommended for agricultural development, rather they should be kept as forest lands.

APA, Harvard, Vancouver, ISO, and other styles

33

H. Prasetyo, B. "MINERALOGICAL AND CHEMICAL CHARACTERISTICS OF SPODOSOLS IN TOBA HIGHLAND, NORTH SUMATRA." Indonesian Journal of Agricultural Science 10, no. 2 (October 25, 2016): 54. http://dx.doi.org/10.21082/ijas.v10n2.2009.p54-64.

Full text

Abstract:

Spodosols are problem soils due to coarse texture, acid soil reaction, low nutrient status, and low soil moisture retention. About 2.16 million ha of Spodosols (1.1% of the Indonesian land areas) distributed in lowland and highland areas in Kalimantan, Sumatra, Sulawesi, and Papua. Spodosols of the Toba highland areas require special attention because these forested lands are gradually cleared, but then abandoned because they are not suitable for agricultural development, causing land degradation. This study aimed to evaluate mineralogical and chemical characteristics of Toba highland Spodosols, North Sumatra, and their implication on agricultural development. Three pedons of the Toba highland Spodosols from Humbang Hasundutan regency were studied, consisted of soils developed from volcanic sand overlying liparite tuff under the influence of low temperature and high rainfall. Field observation was conducted in January 2008. Fifteen soil samples were collected from the three pedons based on the depth of soil horizon. Results indicated that the formation of these Spodosols were influenced by parent material, high elevation (1676-1821 m) above sea level), and by high amount of rainfall (2167 mm). The Spodosols in Toba highland were still in the early stage of development as characterized by shallow effective soil depth (22-23 cm), domination of weatherable minerals (39-81%) in the sand fraction and dominated by amorphous mineral as shown by sum of A1 + 1/2 Fe extracted by ammonium oxalate as much as 0.6-12.8%. The Spodosols were also characterized by coarse texture (66-95% sand fraction in E and B horizons), high organic-C content (1.4-37.7%), acid soil reaction (pH 3.7- 5.3), very high K2O in Oa horizon (552-933 mg kg-1) and B spodic or C horizon (812-2028 mg kg-1), and low base saturation (< 5%). The existence of biological processes in the surface layer was indicated by accumulation of exchangeable bases (0.88-1.14 cmolc kg-1 in Oa horizon and 0.09-0.25 cmolc kg-1 in B horizon), P2O5 (181-298 mg kg-1 in Oa horizon and 3-24 mg kg-1 in E horizon), and K2O (552-933 mg kg-1 in Oa horizon and 13- 30 mg kg-1 in E horizon). However, these nutrients were easily leached after deforestation. With the sandy texture, loose structure, and no vegetation cover, the erosion hazard is high in the deforested areas. Therefore, lands with Spodosols of the Toba highland, especially are not recommended for agricultural development, rather they should be kept as forest lands.

APA, Harvard, Vancouver, ISO, and other styles

34

Villason, Nelvin, and Dernie Olguera. "Physico-Chemical Characteristics of Soils under Cacao Production System in Davao de Oro, Philippines." Southeastern Philippines Journal of Research and Development 25, no. 1 (March 31, 2020): 115–34. http://dx.doi.org/10.53899/spjrd.v25i1.75.

Full text

Abstract:

The study was conducted to understand the physico-chemical characteristics of the soils under cacao production system in Davao de Oro, Philippines. Eight (8) cacao farms were selected for detailed field characterization and sampling of soils for various nutrient analyses. Fertility status of each selected farm was determined by comparing the fertility properties of each soil with the critical nutrient level requirement for cacao. Results showed that most of the soils have a dark brown soil color in the upper horizons, and dark, yellowishbrown in the lower horizons. They range from moderately deep to very deep soil profile (19 to 150 cm), with very friable to extremely firm when moist, slightly sticky to very sticky, and slightly plastic to very plastic when soil consistence is wet. Lower elevations had shallow solum with high water table, resulting in the development of mottles and redoximorphic properties. The amount of clay ranged from 9 to 37%, with 18 to 40% for silt, and 30 to 68% for sand. Most of the cacao farms were intercropped with coconut, durian, lanzones, rubber, and banana. Most of the soils are moderate to slightly acidic, with pH values < 6.5 and CEC ranging from 10 to 34 meq/100g. Moreover, most of the areas have low organic matter (1.66%) except for the areas which continually applied organic matter during fertilization (4.60%). The amount of nitrogen (N) is optimum; however, phosphorus (P) was generally deficient in the soils of most cacao farms surveyed, while amount of potassium (K) ranges from 41.30 to 375.60 mg/kg.

APA, Harvard, Vancouver, ISO, and other styles

35

Abdel Wahed, Fatima Siddig Adam, and Hatil Hashim EL-Kamali. "Physico-chemical Characteristics and Heavymetal contents in Soil of South West EL-Fasher City,Western Sudan." Journal of The Faculty of Science and Technology, no. 6 (January 13, 2021): 62–71. http://dx.doi.org/10.52981/jfst.vi6.604.

Full text

Abstract:

The objectives of this study were to assess levels of trace and heavy elements in South west EL-Fasher cityin North Darfur soils and to provide information regarding accumulation of these metalsin top and sub-soils and to determine the most important soil factors (chemical and physical) which influence trace and heavy elements concentrations in soil.Top and sub-soil samples were taken at various locations in South west EL-Fasher city. The soil characterization was carried out for parameters like pH, E.C, O.C, M.C, soil texture, and trace and heavy elements (Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb and Zn). The results obtained in this research work provides documentation of the relationship between physicochemical properties and heavy metals concentrations in soils of North Darfur. The pH was found to be slightly alkaline. The values of E.C indicated that all samples of the soils are non-saline. Fe, Mn, Cr, Zn and Cu were distributed in very high concentrations compared to other metals. This study will help the industrial section and can be benefit from it for commercial purposes.There were obvious differences in correlation coefficients among the selected criteria (65.6% from total number of correlated between pH and some other selected physicochemical characteristics, whereas 42.3% from the total number were positive correlated between soil texture and some other selected physicochemical characteristics. This study can serves as a database of trace and heavy elements build-up in soil, allowing preventive actions to be taken.

APA, Harvard, Vancouver, ISO, and other styles

36

FOX, C. A., C. TARNOCAI, and R. TROWBRIDGE. "CLASSIFICATION, MACROMORPHOLOGY AND CHEMICAL CHARACTERISTICS OF FOLISOLS FROM BRITISH COLUMBIA." Canadian Journal of Soil Science 67, no. 4 (November 1, 1987): 765–78. http://dx.doi.org/10.4141/cjss87-074.

Full text

Abstract:

The Folisol great group within the Organic soil order was expanded by the Expert Committee on Soil Survey to include the subgroups Hemic, Humic, Lignic and Histic Folisols. Representative Folisols from the Coastal Western Hemlock biogeoclimatic zone in British Columbia were studied to document the macromorphology and chemical characteristics of these subgroups. A proposal for improving F and H horizon designations is also presented. This documentation and improvements to the classification system provide a better basis for the soil surveyor to recognize and account for thick accumulations (> 40 cm) of folic materials overlying mineral or peat materials as well as accumulations (> 10 cm) over rock or fragmental material. Key words: Folisols, organic material, soil classification, Organic soil order

APA, Harvard, Vancouver, ISO, and other styles

37

Malanchuk, Zynovii, Viktor Moshynskyi, Yevhenii Malanchuk, and Valerii Korniienko. "Physico-Mechanical and Chemical Characteristics of Amber." Solid State Phenomena 277 (June 2018): 80–89. http://dx.doi.org/10.4028/www.scientific.net/ssp.277.80.

Full text

Abstract:

Amber of amber-bearing deposits in Rivne-Volyn region of Ukraine has been analyzed. Relying upon instrumental techniques, physical and chemical as well as spectral analyses, and geological prospecting of the deposits, chemical composition and ultimate composition of amber occurring at the territory of Klesiv deposit (Ukraine, Rivne Region, Sarny District) have been identified. Klesiv amber contains the greatest part of inclusions; it contains 18 chemical elements. Basing upon the performed geological cross-section it has been determined that the amber occur in sandy soil and sandy-shale soil. The depth is insignificant – from 1 m to 10 – 15 m. Moreover, to determine the cost, experimental technique has been developed. The technique involves classification of the amber fragments according to their form, dimensions, and colour. Lithologic-and-facies sections of sites of Klesiv deposit have been obtained.

APA, Harvard, Vancouver, ISO, and other styles

38

Navarrete, Ian A., Victor B. Asio, Reinhold Jahn, and Kiyoshi Tsutsuki. "Characteristics and genesis of two strongly weathered soils in Samar, Philippines." Soil Research 45, no. 3 (2007): 153. http://dx.doi.org/10.1071/sr06103.

Full text

Abstract:

Very limited data have been published on the nature of strongly weathered soils in geologically young humid tropical islands. The study evaluated the characteristics and formation of 2 strongly weathered soils in the island of Samar, Philippines, one developed from slate (Bagacay soil) and the other from ultrabasic rock (Salcedo soil). Results revealed that the soils have generally similar morphological characteristics, particularly in terms of colour (2.5 YR-10 R), solum thickness (>5.0 m), and structure (granular to subangular blocky), although the Salcedo soil has much higher clay content than the Bagacay soil. Both soils have similar chemical properties (e.g. acidic, low exchangeable bases) except that the Salcedo soil has lower CEC values but higher exchangeable Na content, resulting in a higher base saturation. They also have high dithionite-extractable Fe contents and very low oxalate/dithionite ratios and are dominated by halloysite, kaolinite, gibbsite, goethite, hematite, and quartz in the clay fraction. Apparently as a result of its more weatherable ultrabasic parent rock and more stable geomorphic surface, the Salcedo soil shows more advanced weathering and soil development than the Bagacay soil. Salcedo soil is classified as Haplic Ferralsol (Dystric, Clayic, Rhodic) in the World Reference Base or very fine, sesquic, isohyperthermic, Rhodic Hapludox in the Soil Taxonomy. Bagacay soil is a Haplic Acrisol (Alumic, Hyperdystric, Clayic, Rhodic) or fine, kaolinitic, isohyperthermic, Typic Paleudult. The Salcedo soil has very high Ni and Cr contents inherited from its ultrabasic parent material. The study reveals that on the geologically young humid tropical island of Samar, the characteristics and genesis of strongly weathered soils are greatly affected by the geochemical characteristic of the parent rock material.

APA, Harvard, Vancouver, ISO, and other styles

39

Gennari, M., M. Negre, and R. Ambrosoli. "Effects of ethylene oxide on soil microbial content and some soil chemical characteristics." Plant and Soil 102, no. 2 (September 1987): 197–200. http://dx.doi.org/10.1007/bf02370703.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Gang Li, Xiao, Zhao Ming Chen, Xiao Hang Li, Qifu Ma, and Yu Lin. "Chemical Characteristics of Physically Separated Soil Organic Matter Fractions in Contrasting Arable Soils." Soil Science 178, no. 3 (March 2013): 128–37. http://dx.doi.org/10.1097/ss.0b013e318295602f.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Pérez, Andrea Cardona, Ronaldo Vilela Wanderley Neto, Rosemary Janneth Llanque Ayala, and José Camapum de Carvalho. "Effect of osmotic suction on the stability of microaggregations and aggregations in a lateritic soil." MATEC Web of Conferences 337 (2021): 01012. http://dx.doi.org/10.1051/matecconf/202133701012.

Full text

Abstract:

It has been established that the matric suction is the portion of the total suction that affects, more directly, the mechanical behaviour of unsaturated soils, being less considered the effects of the osmotic suction. Considering that in the deeply weathered soils will occur, depending on its chemical-mineralogical characteristics, more or less ionic exchange between the soil particles and the chemical products to which the soil has been exposed to, the study of the osmotic suction and its impact on the soil textural and structural stability becomes relevant. In natural terrain and slopes, the chemical products come mostly from agricultural inputs, while in road constructions they come from additives such as lime and cement that are incorporated to the soil with the objective of enhancing its mechanical behaviour. In the case of cast in situ concrete foundations, part of the concrete’s chemical compounds migrates to the surrounding soil. In all of the above mentioned cases, the matric suction acts on the chemical compounds’ migration process, affecting soil’s osmotic suction. Aiming at assessing the impacts of these chemical compounds on the soil properties and behaviour, soil-water characteristics curves of a lateritic soil mixed with a dolomitic limestone and a fertilizer were evaluated. The results show that, in the case of the fertilizer mixture, the variation of osmotic suction contributed to the disaggregation of the soil.

APA, Harvard, Vancouver, ISO, and other styles

42

Topalovic, Ana, Lidija Pfendt, Natalija Perovic, Dragana Djordjevic, Snezana Trifunovic, and Petar Pfendt. "The chemical characteristics of soil which determine phosphorus partitioning in highly calcareous soils." Journal of the Serbian Chemical Society 71, no. 11 (2006): 1219–36. http://dx.doi.org/10.2298/jsc0611219t.

Full text

Abstract:

Phosphorus fractions from three highly calcareous soils (average, 24.9 ? 4.8 %CO3 2-) from sampling sites with a Mediterranean climate were isolated by sequential extraction. In order to provide a more reliable basis for the definition of the obtained P-fractions, principal component analysis was applied and from the chemical characteristics of the 14 investigated soils, those characteristics which define the content and association features of the P-fractions were assessed. The soils are characterized by a relatively high pH (8.0 - 8.2) and by significantly differing contents of organic mater, acid-soluble Mg and total P. These differences affected the various association features of the P-fraction with the soil constituents. The NH4F-P fraction (isolated with 0.5 M NH4F, pH 8.2) is defined by the contents of the main metals of the oxide-hydroxide- clay associations (Al, Fe,Mn) or by the the redox potential (Eh) of Mn. The accumulation of NaOH-phosphorus (extractable with 0.1M NaOH) depended on the constituents of the oxide-hydroxide-clay association, the humic substances and Eh-related factors. In those soils in which NaOH-Pis defined by the oxide-hydroxide-clay association, the participation of Fe as a bridge-forming metal is proposed. The main part of total P, i.e., ?P = TP - (NH 4F-P + NaOH-P) is defined by the status of Mn- and Fe-humic complexes or by the concentration of hydroxyl-ions.

APA, Harvard, Vancouver, ISO, and other styles

43

Broggi, Fábio, Alexandre C. de Oliveira, Fernando J. Freire, Maria B. G. dos S. Freire, and Clístenes W. A. do Nascimento. "Adsorption and chemical extraction of phosphorus as a function of soil incubation time." Revista Brasileira de Engenharia Agrícola e Ambiental 14, no. 1 (January 2010): 32–38. http://dx.doi.org/10.1590/s1415-43662010000100005.

Full text

Abstract:

The objectives of this work were to evaluate the relationship between phosphate adsorption in different mineral soil constituents of the clay fraction to determine the P recovery rate by the Mehlich-1, Mehlich-3, Bray-1 and CaCl2 0.01 mol L-1 extractants as a function of incubation time of soil as well as to compare this rate with physical and chemical soil characteristics. In five soil samples five doses of P based on the maximum phosphate adsorption capacities (MPAC) of the soil, were applied, corresponding to 0, 0.2, 0.4, 0.8 and 1.0 level. The samples were incubated for 90, 60, 30, 15 and 0.5 days. The experiment consisted of a 5 x 4 x 5 factorial (five doses, four extractants and five different periods of incubation time) in five different soils, all distributed in blocks, with three replicates. The P content in soil was determined by the Mehlich-1, Mehlich-3, Bray-1 and CaCl2 0.01 mol L-1 extractants. The soil characteristics that best correlated with the recovery rate of applied P were the remaining P (rem-P) and the MPAC. Soils high in gibbsite presented the highest P adsorption. Soils possessing high MPAC and the low rem-P presented higher reversibility for the non-labile P (residual P) for smaller time periods.

APA, Harvard, Vancouver, ISO, and other styles

44

Parlak, Salih, and Erdem Tetik. "Soil characteristics of natural silver linden (Tilia tomentosa Moench) populations." BioResources 14, no. 4 (October 21, 2019): 9588–600. http://dx.doi.org/10.15376/biores.14.4.9588-9600.

Full text

Abstract:

Studies regarding the determination of the ecological characteristics of the natural distribution areas of the silver linden (Tilia tomentosa Moench) are limited. It is of great importance to select areas with similar natural cultivation characteristics in the plantations established for flower or timber production. Physiographical factors affecting these forests were explored to determine the physical and chemical characteristics of the soil. The soil samples were collected from three natural populations, and a total of 43 samples were examined in terms of aspect, elevation, declivity position, and slope. It was determined that the natural linden populations expanded between the altitudes of 0 m and 400 m and 88% of the populations were denser in aspects with shadow. It was found that 91% of the soil was in the class of “deep to very deep”, 61% showed an expansion in sandy clay loam soils, and 30% showed an expansion in sandy loam soils. Average soil pH ranged between 5.6 and 6.6. The soils were found to be salt-free and slightly limy. In terms of the organic carbon amount, the soils were classified as medium.

APA, Harvard, Vancouver, ISO, and other styles

45

Prihastuti and Sudaryono. "Soil Chemical and Biological Characteristics for Diagnostic the Potency of Acid Dry Land for Soybean Extensification." JOURNAL OF TROPICAL SOILS 18, no. 1 (March 19, 2013): 17. http://dx.doi.org/10.5400/jts.2013.v18i1.17-24.

Full text

Abstract:

The descriptive explored study was conducted in districts Bumi Nabung, Sari Bakti, Seputih Banyak and Rumbia, Central Lampung, Indonesia. The parameters observed consisted of chemical and biological aspects of soil, which directly affected plant growth. This activity was carried out as preliminary studies for the diagnosis of soybean extensification on acid dry land. The results showed that all locations observed were less suitable for soybean development, indicated by low pH values (4.35 – 6.00), nutrient contents (N < 0.1% and C-organic < 2.0%), and low soil microbial populations. Population of bacteria was 17 × 103 – 29 × 104 CFU g-1 soil and fungi was 21 × 101 – 63 ×102 CFU g-1 soil of soils. Beneficial microbe types included non-symbiotic nitrogen-fixing bacteria (with the capability to fix the Nitrogen around 0.16 – 1.53 mM 100 ml-1 medium h-1), phosphate solubilizing bacteria (with the value index 1.22 – 6.25) and arbuscular mycorrhizal fungi (with root colonization by 70.50 – 90.33% and the number of sporeswere 49 – 175 spores g-1 soil). This less suitable land can be improved to become suitable for developing soybean by using innovative technology. Soil biological and chemical improvement technology through liming and amelioration as well as organic and bio-fertilizers applications were required for soybeans extensification on acid dry land.[How to Cite: Prihastuti and Sudaryono. 2013. Soil Chemical and Biological Characteristics for Diagnostic the Potency of Acid Dry Land for Soybean Extensification. J Trop Soils, 18 (1) : 17-24. doi: 10.5400/jts.2013.18.1.17][Permalink/DOI: www.dx.doi.org/10.5400/jts.2013.18.1.17]

APA, Harvard, Vancouver, ISO, and other styles

46

Libus, J., O. Mauer, and D. Vavříček. "Soil preparation by ploughing in the floodplain forest and its influence on vegetation and primary soil characteristics." Journal of Forest Science 56, No. 4 (May 3, 2010): 183–96. http://dx.doi.org/10.17221/46/2009-jfs.

Full text

Abstract:

The paper analyzes the effect of whole-area site preparation by ploughing and of alternate field and forest crops on the understorey, soil biological activity and physical and chemical characteristics in the commercial forest. Another factor of the study was to assess the effect of the clearcut size on forest stands. Analyzed were 20-years-old stands of pedunculate oak (Quercus robur [L.]) on alluvial sites 1L9 (Fraxino pannonicae-Ulmetum). It can be deduced from the conducted analyses that after twenty years neither different site preparation nor clearcut size affected the understorey and soil biological activity. Field crops and forestry in alternation had a significantly adverse effect on porosity and water-retention capacity in the lower layer of top-soil (25–30 cm). Whole-area ploughing had a negative influence on the loss of organic substances due to accelerated mineralization. Nevertheless, the observed differences are not significant; the values did not fall below critical limits and in no case did they affect other studied site parameters or the development of root systems and aboveground parts of oak trees.

APA, Harvard, Vancouver, ISO, and other styles

47

Juita, Nirmala, Iskandar, and Sudarsono. "Characteristic and Genesis of Black and Red Soil Vertisol in Jeneponto Regency." Journal of Tropical Soils 21, no. 2 (February 26, 2017): 123–28. http://dx.doi.org/10.5400/jts.2016.v21i2.123-128.

Full text

Abstract:

One of factors that is interasting from Vertisol to be investigated beside the management of the soil fertility was color variations which can vary from gray to brown and brownish red. Exclusive characteristics of Vertisol are shrink swell capacity with clay dominant clay that make agricultural activities in the Jeneponto area less productive. The purpose of this study was to assess the differences of physical and chemical characteristics of black and red Vertisol in Jeneponto R.egency. The research location was based on the difference and overlaying of soil color. Black soils were taken from the village Bontomarannu and Tonrokassi Timur while red soil and overlaying colors of red and black soil were taken from the village Sarroanging. Results showed that one of the chemical characteristic which was very differences between black and red soils were calcium carbonate and base saturation. Generally CaCO3 on black soil was higher (ranged of 13.20-36.73%) than red soil (ranged of 2.21-13.86%). As for overlaying colors of red and black soil were ranged of 2.62-3.88%. The highest base saturation was found in the black soil that was> 100%, red soil between 40-89% and overlaying colors red and black soil between 80-83%. While Fe, Mn and Al concentrations were highest with citrate dithionite bicarbonate extracts followed by oxalate and pyrophosphate extracts. Clay montmorillonite minerals were present in all profiles observed.

APA, Harvard, Vancouver, ISO, and other styles

48

Grierson, PF, and PM Attiwill. "Chemical Characteristics of the Proteoid Root Mat of Banksia integrifolia L." Australian Journal of Botany 37, no. 2 (1989): 137. http://dx.doi.org/10.1071/bt9890137.

Full text

Abstract:

The proteoid roots of Banksia integrifolia are concentrated in the surface soil, forming a dense mat beneath the litter layer. Water extracts of the proteoid root mat contained a significantly greater amount of hydrogen ions, reductants and an unidentified chelating agent, than water extracts of soil beneath the root mat, of the litter layer and of soil from beyond the proteoid root zone. The results are discussed in relation to previously reported production of organic chelates by plants causing solubilisation of soil phosphates. It is suggested the proteoid roots of B. integrifolia chemically modify the soil environment thereby enhancing nutrient uptake.

APA, Harvard, Vancouver, ISO, and other styles

49

Schanz, Tom, and Hussein H. Karim. "Geotechnical characteristics of some Iraqi gypseous soils." MATEC Web of Conferences 162 (2018): 01005. http://dx.doi.org/10.1051/matecconf/201816201005.

Full text

Abstract:

In Iraq, especially in the last three decades, extensive developments have been evidenced in the regions of gypseous soils due to the need of construction of many numbers of strategic projects. Failure of different structures constructed on gypseous soil in various regions in Iraq have been noticed. For this purpose, three areas in northern Iraq were selected (Samarra, Tikrit and Baiji) to study their geotechnical characteristics due to their high gypsum contents as well as many engineering problems are faced due to dissolution of gypsum. The experimental work involves testing of many properties such as: scanning electron microscopy (SEM), XRD, chemical, physical, compressibility, collapsibility, shear strength and suction. At low stress level, the test results revealed that, higher collapse potential (CP) is recorded for Tikrit soil. While at low stress level, higher CP is obtained for Baiji soil indicating the increase in CP with decreasing gypsum content. Furthermore, the CP significantly increases with increasing stress level and soaking period at a particular stress level. According to severity classification of the collapse potential, Baiji soil is considered as moderate trouble to slight, while Tikrit soil is considered as trouble to moderate. After soaking, both soils become trouble. As well as, the results showed a reduction in Tikrit soil shear parameters ( φ and c ) after soaking period of 6 and 24 hrs as 12.2 to 9.2% in the internal friction angle and 91.5 to 94.2% in cohesion, respectively with respect to dry condition. Maximum total suction is measured for low consistency soils (liquid limit < 30%) represented by Tikrit soil.

APA, Harvard, Vancouver, ISO, and other styles

50

Slattery, W. J., B. Christy, B. M. Carmody, and B. Gales. "Effects of composted feedlot manure on the chemical characteristics of duplex soils in north-eastern Victoria." Australian Journal of Experimental Agriculture 42, no. 3 (2002): 369. http://dx.doi.org/10.1071/ea00121.

Full text

Abstract:

The beef feedlot industry in Australia produces a large amount of solid organic by-product each year that is currently applied to agricultural land as a fertiliser supplement. Manure is known to be a valuable source of organic matter and some plant nutrients, especially nitrogen and phosphorus. In addition, manure contains excessive quantities of cations such as sodium (Na) and potassium (K), which may result in long-term sustainability problems for the soil, particularly when large amounts are applied over short time periods. The aim of this study was to determine the effects of composted beef feedlot manure when applied to agricultural soils. Two sites were selected, one a brown Dermosol and the other a red Kurosol, both in north-eastern Victoria near the Rutherglen Research Institute. Both sites received rates of manure up to 109 t/ha in 1996. In 1997 soil samples were collected and compared with untreated control soils. The Dermosol site was sown to an oat and clover mixture in 1996 and 1997 and the red Kurosol was sown to lupin in 1996 and wheat in 1997. The application of composted bovine manure resulted in a 1% increase in soil organic carbon, an increase in soil pH by 1.5 units, increased levels of magnesium, calcium, nitrogen and K in the surface 10 cm soil layer at both sites and an increase in extractable phosphorus levels in the subsoil. There was no detectable increase in surface Na, although there was a small but significant decrease in Na in the 40–80 cm soil layer. It is suggested that soluble organic compounds, migrating down through the soil profile are able to complex with Na and effectively remove some of this cation from the exchange sites of the clay surfaces. In addition, the high porosity of these soils coupled with the high degree of Na mobility ensures that most of this cation is transported deeper into the soil profile. The beneficial effects of applying composted manure are promising as a means of reducing sodicity although these results will require further validation. In addition, the long-term effects of saturating subsurface soil with Na are also a cause for concern and need to be further investigated.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Chemical soil characteristics'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles