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Journal articles on the topic 'Nutrient input'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Howarth, R. W., F. Chan, D. P. Swaney, R. M. Marino, and M. Hayn. "Role of external inputs of nutrients to aquatic ecosystems in determining prevalence of nitrogen vs. phosphorus limitation of net primary productivity." Biogeochemistry 154, no. 2 (2021): 293–306. http://dx.doi.org/10.1007/s10533-021-00765-z.

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AbstractWhether net primary productivity in an aquatic ecosystem is limited by nitrogen (N), limited by phosphorus (P), or co-limited by N & P is determined by the relative supply of N and P to phytoplankton compared to their elemental requirements for primary production, often characterized by the “Redfield” ratio. The supply of these essential nutrients is affected by both external inputs and biogeochemical processes within the ecosystem. In this paper, we examine external sources of nutrients to aquatic systems and how the balance of N to P inputs influences nutrient limitation. For oce

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2

Poleto, Gian Carlos, Dione Richer Momolli, Mauro Valdir Schumacher, et al. "Interaction of precipitation with tree canopy increases nutrient input." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 16, no. 6 (2021): 1–15. http://dx.doi.org/10.4136/ambi-agua.2761.

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Given that atmospheric deposition is the first source of nutrient input into forest ecosystems, and that the precipitation partition serves as a nutritional source mainly when there is an interaction with the forest canopy, the objective of the present study was to quantify the nutrients input into rainfall, throughfall and stemflow in Eucalyptus urophylla stands with partial exclusion (E) and without exclusion (WE) of throughfall. The experiment was conducted in the northeast of the state of Paraná-Brazil, in the municipality of Telêmaco Borba. The partial precipitation exclusion system (E) i

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3

Chang, Chung-Te, Yu-Ting Shih, Li-Chin Lee, et al. "Effects of Land Cover and Atmospheric Input on Nutrient Budget in Subtropical Mountainous Rivers, Northeastern Taiwan." Water 12, no. 10 (2020): 2800. http://dx.doi.org/10.3390/w12102800.

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The nutrient budget, the difference between the nutrient output via stream and input via precipitation, can provide insights into how environmental processes affect forested ecosystem biogeochemistry. In this study, field measurements of the nutrient budgets—including Na+, Cl−, K+, Mg2+, Ca2+, NO3−, and SO42−—of 19 sites were conducted in Feitsui Reservoir Watershed (FRW) of northeastern Taiwan. A series of power-law regressions were developed to establish the relationship of the nutrient budget to the discharge, nutrient input, agricultural land cover, and slope. The result show that the week

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4

Gophen, Moshe. "Are Water Level Fluctuations and Pelagic Water Quality in Lake Kinneret Directly Related? Perspectives of Nutrient Dynamics." Water 15, no. 8 (2023): 1473. http://dx.doi.org/10.3390/w15081473.

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Long-term records of Water Level Fluctuations (WLF) and nutrient dynamics in Lake Kinneret have indicated an independence between them. The winter’s high WLF with nutrient-rich conditions and the summer’s low WLF with nutrient-poor conditions are recurrent states. Are Water Level Fluctuations and Lake Kinneret’s pelagic water quality related directly or indirectly? Overall, the results found that WLF and nutrient dynamics in the pelagic zone of Lake Kinneret are not co-partners, but independent escorts. The common periodical (monthly) distribution of nutrient concentrations in the epilimnion o

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5

Li, R. H., S. M. Liu, Y. W. Li, G. L. Zhang, J. L. Ren, and J. Zhang. "Nutrient dynamics in tropical rivers, estuarine-lagoons, and coastal ecosystems along the eastern Hainan Island." Biogeosciences Discussions 10, no. 6 (2013): 9091–147. http://dx.doi.org/10.5194/bgd-10-9091-2013.

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Abstract. Nutrient dynamics were studied along the eastern Hainan Island based on field observations during 2006–2009, to understand nutrient biogeochemical processes and to have an overview of human perturbations on coastal ecosystems in this tropical region. The concentrations of nutrients in the rivers had seasonal variations enriched with dissolved inorganic nitrogen (DIN). High riverine concentrations of nitrate were mainly originated from agricultural fertilizer input. The ratios of DIN : PO43− ranged from 37 to 1063, suggesting preferential PO43− relative to nitrogen in the rivers. The

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6

Giang, P. H., H. Harada, S. Fujii, et al. "Transition of fertilizer application and agricultural pollution loads: a case study in the Nhue-Day River basin." Water Science and Technology 72, no. 7 (2015): 1072–81. http://dx.doi.org/10.2166/wst.2015.312.

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Rapid socio-economic development in suburban areas of developing countries has induced changes in agricultural waste and nutrient management, resulting in water pollution. The study aimed at estimating agricultural nutrient cycles and their contribution to the water environment. A material flow model of nitrogen (N) and phosphorus (P) was developed focusing on agricultural activities from 1980 to 2010 in Trai hamlet, an agricultural watershed in Nhue-Day River basin, Vietnam. The model focused on the change in household management of human excreta and livestock excreta, and chemical fertilizer

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7

Shi, Jie, Qian Leng, Junying Zhu, Huiwang Gao, Xinyu Guo, and Xinyan Mao. "Influences of Nutrient Sources on the Alternation of Nutrient Limitations and Phytoplankton Community in Jiaozhou Bay, Southern Yellow Sea of China." Sustainability 12, no. 6 (2020): 2224. http://dx.doi.org/10.3390/su12062224.

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A marine ecosystem box model was developed to reproduce the seasonal variations nutrient concentrations and phytoplankton biomasses in Jiaozhou Bay (JZB) of China. Then, by removing each of the external sources of nutrients (river input, aquaculture, wastewater discharge, and atmospheric deposition) in the model calculation, we quantitatively estimated its influences on nutrient structure and the phytoplankton community. Removing the river input of nutrients enhanced silicate (SIL) limitation to diatoms (DIA) and decreased the ratio of DIA to flagellates (FLA); removing the aquaculture input o

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8

Muhilan, Gangadaran, Venkatraman Ganesan Venkatesan, A. Kalaiselvi, Kannan Poongothai Leninbabu, S. Harini, and M. Karthikeyan. "Unravelling the Zone of Rhizosphere and its Biotic Interaction over Plant-Soil Relationship." International Journal of Current Microbiology and Applied Sciences 13, no. 11 (2024): 68–81. https://doi.org/10.20546/ijcmas.2024.1311.009.

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Intensive agriculture, while increasing food production, has caused second generation problems in respect of nutrient imbalance including greater mining of soil nutrients to the extent of 10 million tons every year depleting soil fertility, emerging deficiencies of secondary and micronutrients, decline of water table and its quality of water, decreasing organic carbon content, and overall deterioration in soil health. Indian soils not only show deficiency in both primary nutrients (Nitrogen, Phosphorous and Potassium) but also of secondary nutrients (Sulphur, Calcium and Magnesium) and micronu

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9

Rachmansyah, Rachmansyah, Hidayat Suryanto Suwoyo, Muh Chaidir Undu, and Makmur Makmur. "PENDUGAAN NUTRIENT BUDGET TAMBAK INTENSIF UDANG, Litopenaeus vannamei." Jurnal Riset Akuakultur 1, no. 2 (2016): 181. http://dx.doi.org/10.15578/jra.1.2.2006.181-202.

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Penelitian ini bertujuan untuk mendapatkan nutrient budget tambak intensif udang Litopenaeus vannamei sebagai acuan alokasi input produksi pada tingkat kapasitas asimilasi lingkungan perairan. Pendugaan nutrient budget tambak udang intensif menggunakan pendekatan mass balance, dihitung berdasarkan input nutrien nitrogen - N dan fosfor – P yang berasal dari pakan, benih, pupuk, media probiotik, inflow, dan output nutrien yang ada pada produksi udang, outflow, dan endapan lumpur di dasar tambak. Sampel air, tanah, sedimen, plankton diambil sebelum penebaran dan setiap dua minggu selama pemelihar

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10

Wolters, Tim, Ian McNamara, Björn Tetzlaff, and Frank Wendland. "Germany-Wide High-Resolution Water Balance Modelling to Characterise Runoff Components as Input Pathways for the Analysis of Nutrient Fluxes." Water 15, no. 19 (2023): 3468. http://dx.doi.org/10.3390/w15193468.

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The input of nutrients into surface waters and groundwater is directly linked to runoff components. Due to the different physicochemical behaviour of nitrogen and phosphorus compounds, the individual runoff components have different significance as input pathways. Within the scope of the Germany-wide project AGRUM-DE, spatially differentiated runoff components were modelled with the water balance model mGROWA at a resolution of 100 m. The modelled distributed runoff components include total runoff, surface runoff, drainage runoff, natural interflow, direct runoff from urban areas, and groundwa

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11

Oita, Azusa, Kiwamu Katagiri, Tetsuya Eguchi, et al. "Nutrient-extended input–output (NutrIO) method for the food nitrogen footprint." Environmental Research Letters 16, no. 11 (2021): 115010. http://dx.doi.org/10.1088/1748-9326/ac2c35.

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Abstract Agro-food systems require nutrient input from several sources to provide food products and food-related services. Many of the nutrients are lost to the environment during supply chains, potentially threatening human and ecosystem health. Countries therefore need to reduce their nutrient/nitrogen footprints. These footprints are importantly affected by links between sectors. However, existing assessments omit the links between sectors, especially between the agriculture, manufacturing, and energy sectors. We propose a novel approach called the nutrient-extended input–output (NutrIO) me

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12

Morais, Yasmim Yathiara Gomes Araújo, Fernando José Freire, Rosival Barros de Andrade Lima, Edilane Alice de Alcântara Assunção, Shyrlaine Lilian Moura Leão, and Lidiana Nayara Ralph. "STEMFLOW NUTRIENT INPUT IN TREES IN A TROPICAL FOREST IN PERNAMBUCO, BRAZIL." FLORESTA 51, no. 3 (2021): 604. http://dx.doi.org/10.5380/rf.v51i3.71464.

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Rainfall is the main source of water in forest ecosystems and stemflow is an important pathway for nutrients to enter these ecosystems. Thus, this study aimed to evaluate effective precipitation in a fragment of tropical forest and stemflow nutrient input of tree species in different periods of rainfall. Total precipitation and throughfall were measured using rain gauges inside and at the edge of the fragment. After a phytosociological survey, nine species with the highest absolute density in the fragment were chosen and three individuals were selected. Water collectors were fixed around their

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13

Zheng*, Youbin, Thomas Graham, Stefan Richard, and Mike Dixon. "Current Fertilizer Input for Pot Gerbera Production Can Be Reduced by More than 50%." HortScience 39, no. 4 (2004): 775D—775. http://dx.doi.org/10.21273/hortsci.39.4.775d.

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Pot gerbera (Gerbera jamesonii Var. `Shogun') plants were subirrigated with one of four nutrient solutions (10, 25, 50, and 100% of full strength) in order to determine whether currently used commercial nutrient solution concentrations can be reduced without negative impact on crop production. Nutrient concentration levels did not affect leaf area, flower number and appearance, and plant total dry weight. There were no significant differences in leaf chlorophyll content between the plants that received the 50 and 100% strength nutrient solutions. It is concluded that nutrient solution concentr

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14

Lavery, T. J., B. Roudnew, L. Seuront, J. G. Mitchell, and J. Middleton. "Can whales mix the ocean?" Biogeosciences Discussions 9, no. 7 (2012): 8387–403. http://dx.doi.org/10.5194/bgd-9-8387-2012.

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Abstract. Ocean mixing influences global climate and enhances primary productivity by transporting nutrient rich water into the euphotic zone. The contribution of the swimming biosphere to diapycnal mixing in the ocean has been hypothesised to occur on scales similar to that of tides or winds, however, the extent to which this contributes to nutrient transport and stimulates primary productivity has not been explored. Here, we introduce a novel method to estimate the diapycnal diffusivity that occurs as a result of a sperm whale swimming through a pycnocline. Nutrient profiles from the Hawaiia

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15

Suharto, Yohanes Bayu, Herry Suhardiyanto, Anas Dinurroman Susila, and Supriyanto. "Artificial Neural Networks Model for Photosynthetic Rate Prediction of Leaf Vegetable Crops under Normal and Nutrient-Stressed in Greenhouse." HAYATI Journal of Biosciences 32, no. 2 (2024): 300–309. https://doi.org/10.4308/hjb.32.2.300-309.

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Photosynthesis is one of the essential processes in plant physiology that produces glucose and oxygen to support plant growth. Nutrient stress conditions will affect the photosynthetic rate in plants. The model predicting photosynthetic rates based on environmental conditions, nutrients, and plant types will be highly beneficial for farmers in tweaking these variables to maximize plant photosynthesis. This research focused on assessing the impact of nutrient stress on the photosynthetic rate in leaf vegetable crops and aimed to create a model using artificial neural networks (ANN) to predict p

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16

Ibrekk, Hans Olav, Jarle Molvær, and Bjørn Faafeng. "Nutrient Loading to Norwegian Coastal Waters and Its Contribution to the Pollution of the North Sea." Water Science and Technology 24, no. 10 (1991): 239–49. http://dx.doi.org/10.2166/wst.1991.0297.

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The North Sea Declaration aims at reducing the load of nutrients to the North Sea by the order of 50 per cent between 1985 and 1995. This paper gives an overview of the nutrient loading to the Norwegian coastal waters, and an estimate of how much of this loading reaches the local Skagerrak coast and the North Sea. The average annual nutrient load to coastal waters from land-based sources along the Norwegian North Sea coastline (from the Swedish border to 62°N) is approximately 3,600 tons of phosphorus and 70,000 tons of nitrogen. Municipal wastewater is the main source of phosphorus (44 per ce

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17

Tong, Yichao, Yuqing Sun, Jing Xia, and Jinlin Liu. "Research Progress on the Characteristics of Nitrogen and Phosphorus Uptake by Ulva prolifera, the Dominant Macroalga Responsible for Green Tides in the Yellow Sea." Coasts 5, no. 1 (2025): 10. https://doi.org/10.3390/coasts5010010.

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The abnormal proliferation of Ulva in the Yellow Sea has instigated the notorious green tide phenomenon. Mitigating this ecological challenge necessitates a holistic comprehension of Ulva’s nitrogen and phosphorus uptake behaviors. Investigating the mechanisms governing nutrient absorption, encompassing factors like concentration, form, and input dynamics, has unveiled their profound influence on nutrient assimilation rates. The nutrient absorption characteristics of Ulva prolifera, including its preference for abundant nutrients, a high nitrogen-to-phosphorus (N/P) ratio, and its ability to e

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18

Setyastika, Ursulin Sacer, Sri Rahayu Utami, Syahrul Kurniawan, and Christanti Agustina. "Is Long-term Cassava-based Agriculture Sustainable? (Case Study of Potassium Content in the Soil)." IOP Conference Series: Earth and Environmental Science 1131, no. 1 (2023): 012003. http://dx.doi.org/10.1088/1755-1315/1131/1/012003.

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Abstract Farmer’s interest in planting cassava is relatively high because cassava is one of tolerant commodities toward drought, and low soil fertility. With minimum input, cassava still grow and produce. However, cassava absorb greater nutrients, especially potassium (K), leading to the depletion of essential nutrient availability. This research was carried out in Pati, Central Java, aimed to determine K nutrients status in the soil at the various durations of cassava land use. The research consisted of two factors, i.e 1) duration under cassava (five years, 10 yr, and 15 yr), and 2) slope (8

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19

Mendes, Marlete Moreira de Sousa, Claudivan Feitosa de Lacerda, Francisco Éden Paiva Fernandes, Ana Clara Rodrigues Cavalcante, and Teógenes Senna de Oliveira. "Nutrient input and output in an agro forestry system in a semiarid region of Brazil." Forestry Research and Engineering: International Journal 3, no. 4 (2019): 146–52. http://dx.doi.org/10.15406/freij.2019.03.00091.

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Alternatives to traditional agricultural farming practices that combine production and environmental conservation, such as agroforestry systems, are currently being studied. This study aimed to quantify the contribution of trees to nutrient input and output in crops grown in an agrosilvopastoral system in the municipality of Sobral, Ceará State, Brazil. Nutrient concentrations were quantified in shade and sun leaves of Cordia oncocalyx Allemão (called pau-branco) trees in the rainy and dry seasons and in maize leaves at the time of harvest. Nutrient concentrations in different soil layers (0-1

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20

Gourley, C. J. P., and D. M. Weaver. "Nutrient surpluses in Australian grazing systems: management practices, policy approaches, and difficult choices to improve water quality." Crop and Pasture Science 63, no. 9 (2012): 805. http://dx.doi.org/10.1071/cp12154.

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Nutrient surpluses, inefficiencies in nutrient use, and inevitable leakage of nutrients from grazed animal production systems are putting growing pressure on Australian inland and coastal water resources. While there are some examples of regulatory policy approaches in Australia which aim to reduce nutrient emissions and improve water quality around important and impaired coastal and inland waters, most policy options involve voluntary schemes, often including financial incentives to both industry organisations and farmers to offset the costs of implementing improved management practices. In c

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21

Kinter, Bryan T., and Stuart A. Ludsin. "Nutrient inputs versus piscivore biomass as the primary driver of reservoir food webs." Canadian Journal of Fisheries and Aquatic Sciences 70, no. 3 (2013): 367–80. http://dx.doi.org/10.1139/cjfas-2012-0369.

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We used an ecosystem-based modeling approach, Ecopath with Ecosim, to explore the relative importance of a top-down biotic management lever (top predator introduction) versus a bottom-up abiotic management lever (alteration of nutrient inputs) in regulating biomass in reservoir food webs. To do so, we modeled three Ohio reservoirs that varied in ecosystem productivity. For each, we simulated five hybrid striped bass (Morone chrysops × Morone saxatilis) (introduced top predator) biomass levels at three nutrient input levels (n = 15 simulations per reservoir). Nutrient inputs influenced the food

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22

Niu, Lixia, Pieter van Gelder, Xiangxin Luo, Huayang Cai, Tao Zhang, and Qingshu Yang. "Implications of Nutrient Enrichment and Related Environmental Impacts in the Pearl River Estuary, China: Characterizing the Seasonal Influence of Riverine Input." Water 12, no. 11 (2020): 3245. http://dx.doi.org/10.3390/w12113245.

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The Pearl River estuary is an ecologically dynamic region located in southern China that experiences strong gradients in its biogeochemical properties. This study examined the seasonality of nutrient dynamics, identified related environmental responses, and evaluated how river discharge regulated nutrient sink and source. The field investigation showed significant differences of dissolved nutrients with seasons and three zones of the estuary regarding the estuarine characteristics. Spatially, nutrients exhibited a clear decreasing trend along the salinity gradient; temporally, their levels wer

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23

Narender, M. S. Puneeth Raj, and Vishal Ahlawat. "Effect of Organic Cultivation on Soil Properties under Different Cropping Systems: A Review." International Journal of Plant & Soil Science 35, no. 17 (2023): 411–16. http://dx.doi.org/10.9734/ijpss/2023/v35i173224.

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Modern farming requires sustainable use of soil resources because soil quality can easily be deteriorated within a short period of time. For sustainable agricultural productivity, it is utmost important to improve and maintain soil physical, chemical and biological health. The micro biodiversity plays a crucial role in ensuring the availability of inherent and applied nutrients in the soil to the crop plants. The characterization of physical, chemical and microbiological properties of soil in relation to organic cultivation is important for recommending the nutrient and water input for optimum

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24

Tilahun, Amsalu, Wim Cornelis, Steven Sleutel, Abebe Nigussie, Bayu Dume, and Eric Van Ranst. "The Potential of Termite Mound Spreading for Soil Fertility Management under Low Input Subsistence Agriculture." Agriculture 11, no. 10 (2021): 1002. http://dx.doi.org/10.3390/agriculture11101002.

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Termites can play a localized prominent role in soil nutrient availability and cycling because mound materials are often enriched in nutrients relative to surrounding soil. Mound materials may thus prove to be useful amendments, though evidently mound spatial arrangement needs to be considered as well. Furthermore, it is not known if gradients of soil properties exist from termite mound to interspace sites. Studying both aspects would be required to decide whether spreading of mounds or spatially differentiated management of surrounding crop to accommodate soil fertility gradients would be val

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Tilahun, Amsalu, Wim Cornelis, Steven Sleutel, Abebe Nigussie, Bayu Dume, and Eric Van Ranst. "The Potential of Termite Mound Spreading for Soil Fertility Management under Low Input Subsistence Agriculture." Agriculture 11, no. 10 (2021): 1002. http://dx.doi.org/10.3390/agriculture11101002.

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Termites can play a localized prominent role in soil nutrient availability and cycling because mound materials are often enriched in nutrients relative to surrounding soil. Mound materials may thus prove to be useful amendments, though evidently mound spatial arrangement needs to be considered as well. Furthermore, it is not known if gradients of soil properties exist from termite mound to interspace sites. Studying both aspects would be required to decide whether spreading of mounds or spatially differentiated management of surrounding crop to accommodate soil fertility gradients would be val

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26

Parviainen, Tuure, and Juha Helenius. "Trade Imports Increasingly Contribute to Plant Nutrient Inputs: Case of the Finnish Food System 1996–2014." Sustainability 12, no. 2 (2020): 702. http://dx.doi.org/10.3390/su12020702.

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In Finland, while total agricultural production has remained relatively constant, nutrient input from industrial mineral fertilizers has declined over the past 20 years, which has been the target of environmental policies due to eutrophication risks. From 1996 to 2014, the use of nitrogen (N) declined by 18%, phosphorus (P) by 49%, and potassium (K) by 49%. However, at the same time, the international agricultural products trade has increased dramatically by mass (58%), and Finland has increased imports of food and feed products, such as, protein feeds, vegetables, and fruits. We analyzed the

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Borgonjen-van den Berg, Karin J., Jeanne H. M. de Vries, Prosper Chopera, Edith J. M. Feskens, and Inge D. Brouwer. "Sensitivity of Food-Based Recommendations Developed Using Linear Programming to Model Input Data in Young Kenyan Children." Nutrients 13, no. 10 (2021): 3485. http://dx.doi.org/10.3390/nu13103485.

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Food-based recommendations (FBR) developed using linear programming generally use dietary intake and energy and nutrient requirement data. It is still unknown to what extent the availability and selection of these data affect the developed FBR and identified problem nutrients. We used 24 h dietary recalls of 62 Kenyan children (4–6 years of age) to analyse the sensitivity of the FBR and problem nutrients to (1) dietary intake data, (2) selection criteria applied to these data and (3) energy and nutrient requirement data, using linear programming (Optifood©), by comparing a reference scenario w

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Zheng, Yuexin, Qianyang Wang, Xuan Zhang, et al. "Nitrogen and Phosphorus Retention Risk Assessment in a Drinking Water Source Area under Anthropogenic Activities." Remote Sensing 14, no. 9 (2022): 2070. http://dx.doi.org/10.3390/rs14092070.

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Excessive nitrogen (N) and phosphorus (P) input resulting from anthropogenic activities seriously threatens the supply security of drinking water sources. Assessing nutrient input and export as well as retention risks is critical to ensuring the quality and safety of drinking water sources. Conventional balance methods for nutrient estimation rely on statistical data and a huge number of estimation coefficients, which introduces uncertainty into the model results. This study aimed to propose a convenient, reliable, and accurate nutrient prediction model to evaluate the potential nutrient reten

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Yang, Junhui, Anzhi Wang, Lidu Shen, et al. "The Impact of Canopy on Nutrient Fluxes through Rainfall Partitioning in a Mixed Broadleaf and Coniferous Forest." Forests 15, no. 4 (2024): 623. http://dx.doi.org/10.3390/f15040623.

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Rainfall constitutes the primary input in the nutrient flux within forest ecosystems. The forest canopy modulates this flux by partitioning rainfall and selectively absorbing or adding nutrients. In mixed forests, variation in tree species composition regulates rainwater chemical composition, potentially leading to spatial heterogeneity in nutrient distribution and influencing nutrient cycling processes. This study examined the partitioning of rainfall into throughfall and stemflow, as well as their associated nutrient concentrations and fluxes, in a mixed broadleaf and coniferous forest on Ch

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Wilson, Samuel T., Nicholas J. Hawco, E. Virginia Armbrust, et al. "Kīlauea lava fuels phytoplankton bloom in the North Pacific Ocean." Science 365, no. 6457 (2019): 1040–44. http://dx.doi.org/10.1126/science.aax4767.

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From June to August 2018, the eruption of Kīlauea volcano on the island of Hawai‘i injected millions of cubic meters of molten lava into the nutrient-poor waters of the North Pacific Subtropical Gyre. The lava-impacted seawater was characterized by high concentrations of metals and nutrients that stimulated phytoplankton growth, resulting in an extensive plume of chlorophyll a that was detectable by satellite. Chemical and molecular evidence revealed that this biological response hinged on unexpectedly high concentrations of nitrate, despite the negligible quantities of nitrogen in basaltic la

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Kurnain, Ahmad, M. Mahbub, M. Septiana, A. M. Makalew, and A. Murjani. "Internal flow of nutrients in organic farming systems in tidal swamp." IOP Conference Series: Earth and Environmental Science 974, no. 1 (2022): 012102. http://dx.doi.org/10.1088/1755-1315/974/1/012102.

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Abstract Sustainable nutrient management is critical to the success of an agroecosystem. The potential of nutrient flow to agroecosystems in tidal swamps can be observed in several of soil and water management. Tidal swamp land management based on surjan and tabukan system are often used to farm several sub-agricultures, namely rice fields, ponds, and citrus plantations. This study aimed to determine N nutrients’ input, output, and internal flow in organic farming systems. This study is limited to observing the internal components. The integrated organic farming system in tidal swampland, usua

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Fripiat, François, Alfredo Martínez-García, Dario Marconi, et al. "Nitrogen isotopic constraints on nutrient transport to the upper ocean." Nature Geoscience 14, no. 11 (2021): 855–61. http://dx.doi.org/10.1038/s41561-021-00836-8.

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AbstractOcean circulation supplies the surface ocean with the nutrients that fuel global ocean productivity. However, the mechanisms and rates of water and nutrient transport from the deep ocean to the upper ocean are poorly known. Here, we use the nitrogen isotopic composition of nitrate to place observational constraints on nutrient transport from the Southern Ocean surface into the global pycnocline (roughly the upper 1.2 km), as opposed to directly from the deep ocean. We estimate that 62 ± 5% of the pycnocline nitrate and phosphate originate from the Southern Ocean. Mixing, as opposed to

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Lodhiyal, Neelu. "Forest Floor, Litter Fall and Nutrient Dynamics in Young aged Shisham Forests in Moist Plain area of Kumaon of Uttarakhand." Indian Journal of Forestry 35, no. 3 (2012): 321–30. http://dx.doi.org/10.54207/bsmps1000-2012-z2yb40.

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Present paper illustrates the litter and nutrient dynamics of Shisham (Dalbergia sissoo Roxb.) forests at 1-3 years aged growing in Tarai belt of Kumaon of Uttarakhand. The objectives of this study were to determine the litter inputs, nutrients (NPK) and their dynamics. Shisham is commonly occurred in the nutrient poor site because of their leguminous features. This study was carried out in young aged Shisham forests for the estimation of tree density, forest floor, litter fall and nutrients content and returns. The litter trap methods were used for the estimation of forest floor biomass and l

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Järvenranta, Kirsi, Perttu Virkajärvi, and Helvi Heinonen-Tanski. "The flows and balances of P, K, Ca and Mg on intensively managed Boreal high input grass and low input grass-clover pastures." Agricultural and Food Science 23, no. 2 (2014): 106–17. http://dx.doi.org/10.23986/afsci.41195.

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The main objective of the study was to compare nutrient balances of phosphorus (P), potassium (K), magnesium (Mg) and calcium (Ca) on fertilized grass pasture (high input) and unfertilized grass-clover pasture (low input) both grazed by dairy cattle. The second aim was to quantify P loss in surface runoff from the fertilized grass pasture. The study was conducted on a lysimeter field that included two surface runoff collector ditches. The whole area was rotationally stocked five times per year and the amount of milk was recorded. Nutrient balances were negative on both grass and grass-clover p

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Firstater, Fausto N., Fernando J. Hidalgo, Betina J. Lomovasky, Juan Tarazona, Georgina Flores, and Oscar O. Iribarne. "Coastal upwelling may overwhelm the effect of sewage discharges in rocky intertidal communities of the Peruvian coast." Marine and Freshwater Research 61, no. 3 (2010): 309. http://dx.doi.org/10.1071/mf09102.

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In coastal productive environments, such as upwelling systems, sewage effluents might represent an important input of nutrients affecting intertidal community development and structure. Using descriptive and experimental approaches, the community spatial variation and early succession in relation to a point-source effluent discharge in a rocky intertidal of an upwelling affected area (Ancón Bay, Peru) was analysed. The relative contribution of herbivory to the observed patterns was also analysed. Dissolved nutrient concentrations, macroalgal isotopic signatures and N content revealed a signifi

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Chikkasiddaiah, Chandana, Parthasarathy Govindaswamy, and Mallikarjunaswamy Srikantaswamy. "An efficient hydro-crop growth prediction system for nutrient analysis using machine learning algorithm." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 6 (2023): 6681. http://dx.doi.org/10.11591/ijece.v13i6.pp6681-6690.

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<span lang="EN-US">The hydro nutrient management (HNM) for crop yield is effectively improved using proposed system. A hydro-crop growth prediction system (HCGPS) is designed using machine learning. The reconfigurable nutrients uptake crop yield prediction rate is enhanced. This proposed HCGPS is used to predict the crop yield by considering input parameters such as nutrient index (NI), electric conductivity limit (ECL), ion concentration factors (ICF) and dry weight of the crop and crop yield rate (CYR) to analyze the positive and negative correlation with crop growth. The proposed syst

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Chandana, Chikkasiddaiah, Govindaswamy Parthasarathy, and Srikantaswamy Mallikarjunaswamy. "An efficient hydro-crop growth prediction system for nutrient analysis using machine learning algorithm." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 6 (2023): 6681–90. https://doi.org/10.11591/ijece.v13i6.pp6681-6690.

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The hydro nutrient management (HNM) for crop yield is effectively improved using proposed system. A hydro-crop growth prediction system (HCGPS) is designed using machine learning. The reconfigurable nutrients uptake crop yield prediction rate is enhanced. This proposed HCGPS is used to predict the crop yield by considering input parameters such as nutrient index (NI), electric conductivity limit (ECL), ion concentration factors (ICF) and dry weight of the crop and crop yield rate (CYR) to analyze the positive and negative correlation with crop growth. The proposed system is used

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Kadlec, John A. "Input–Output Nutrient Budgets for Small Diked Marshes." Canadian Journal of Fisheries and Aquatic Sciences 43, no. 10 (1986): 2009–16. http://dx.doi.org/10.1139/f86-246.

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Input–output nutrient budgets were constructed for 8 and 10 diked contiguous 4- to 6-ha marshes in 1981 and 1982, respectively. Because the marshes studied were created by diking within a larger marsh, the water budgets were dominated by water pumped in to replace roughly equal evapotranspiration and seepage losses. Chloride budgets could not be used to confirm water budgets, apparently because of a transfer to the sediments by a freezing-out process in winter and a subsequent diffusion back into the surface water during the ice-free season. With replicated ponds and accurate water budgets, go

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Men, Xiaopeng, Zongzhen Fan, Yanfang Wang, Yubin Wang, Yi Wang, and Zhenhai Han. "Evaluation of Fertilizer Inputs and Soil Nutrient Status in Apple Orchards in China." Journal of Physics: Conference Series 2463, no. 1 (2023): 012069. http://dx.doi.org/10.1088/1742-6596/2463/1/012069.

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Abstract Apple is an important horticultural crop in China and its production consumes large amounts of Chemical fertilizers. In a survey of more than 300 Chinese apple growers, we found that small farmers’ fertilizer inputs are blind. Current research lacks a comprehensive evaluation of fertilizer inputs and soil nutrient status for apple production in China, but the evaluation work will play a supporting role in the macro management decision of nutrient resources. In this study, a database of fertilizer inputs and soil nutrients in five major apple producing areas in China was constructed by

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Hendrix, Paul F. "Strategies for research and management in reduced-input agroecosystems." American Journal of Alternative Agriculture 2, no. 4 (1987): 166–72. http://dx.doi.org/10.1017/s0889189300009280.

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AbstractDeveloping reduced-input agroecosystems is a challenge to researchers and practitioners in a number of disciplines. In particular, because of the complexity of managerial inputs, understanding the effects of decreases in levels of one or several inputs presents a difficult experimental problem. Moderate reductionism is proposed as an appropriate hierarchical analysis, which first characterizes system level behavior and then explains it in terms of system components and their interactions. An example is given using reduced nitrogen fertilizer inputs; higher nitrogen use efficiency at lo

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Hershey, Anne E., Allison L. Hiltner, Meredith A. J. Hullar, et al. "Nutrient Incluence on a Stream Grazer: Orthocladius Microcommunities Respond to Nutrient Input." Ecology 69, no. 5 (1988): 1383–92. http://dx.doi.org/10.2307/1941635.

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Crews, Timothy E., and Stephen R. Gliessman. "Raised field agriculture in Tlaxcala, Mexico: An ecosystem perspective on maintenance of soil fertility." American Journal of Alternative Agriculture 6, no. 1 (1991): 9–16. http://dx.doi.org/10.1017/s088918930000374x.

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AbstractRaised field agriculture in southwest Tlaxcala, Mexico, is a sophisticated, intensive traditional system of wetland cultivation that dates back to as early as 300 B. C. It provides an exceptional example of how farming practices can fit into and even take advantage of ecosystem processes. The raised fields appear to be largely self-reliant in energy and nutrients. Tlaxcalan farmers use canals, aquatic plants, polycultures, alder (Alnus firmifolia) and other trees to intensify the nutrient input into their fields and minimize nutrient losses through leaching and runoff Although the rais

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Marques, Patricia Angélica Alves, Fernando Campos Mendonça, Tadeu Alcides Marques, et al. "Hydrogel polymer as a sustainable input for mitigating nutrient leaching and promoting plant growth in sugarcane crops." Acta Scientiarum. Agronomy 47, no. 1 (2024): e68642. https://doi.org/10.4025/actasciagron.v47i1.68642.

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Nutrient leaching is a common issue in sandy soils. The use of hydrogel polymers can mitigate this problem by enhancing soil water retention. This study aims to assess the effect of hydrogel polymer application on nutrient leaching in sugarcane-cultivated soil and its impact on plant growth over a 196-day cycle. Parameters examined include soil water retention (%), nutrient leaching (N, P, K, Ca, Mg, and S) analyzed through the water collected after natural drainage, as well as various plant growth parameters such as stem height and diameter, and fresh and dry stem and leaf mass. The highest s

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Adhar, Saiful, Munawwar Khalil, Erlangga Erlangga, et al. "Model of nitrogen-phosphorus ratio and phytoplankton relationship in lake Laut Tawar, Indonesia." Depik 12, no. 3 (2023): 274–83. http://dx.doi.org/10.13170/depik.12.3.33935.

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Phytoplankton blooms in the lake cause ecological, economic, health, energy, and aesthetic losses. It reduces water quality and biota diversity, creates toxins in the waters, and changes the structures and functions of the ecosystem. The essential nutrients for the growth of phytoplankton are nitrogen and phosphorus. Controlling phytoplankton growth can be managed by controlling the limiting nutrient input. This study aims to identify the limiting nutrient, analyze variations in TN:TP ratio spatially and temporally, and model TN:TP ratio and chlorophyll-a relationship. This study used secondar

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Schoenau, J. J., and J. G. Davis. "Optimizing soil and plant responses to land-applied manure nutrients in the Great Plains of North America." Canadian Journal of Soil Science 86, no. 4 (2006): 587–95. http://dx.doi.org/10.4141/s05-115.

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Animal manures are recognized as valuable sources of plant nutrients in cropping systems and also play a role in soil improvement through the input of organic matter. Using recent research examples from Saskatchewan and Colorado, this paper covers beneficial management practices for effective recycling of manure nutrients applicable to the Great Plains region of North America. Challenges in using animal manures as fertilizers include low nutrient content per unit weight, variability and availability of nutrient content, and a balance of available nutrients that often does not meet the relative

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Thomson, V. P., and M. R. Leishman. "Survival of native plants of Hawkesbury Sandstone communities with additional nutrients: effect of plant age and habitat." Australian Journal of Botany 52, no. 2 (2004): 141. http://dx.doi.org/10.1071/bt03047.

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Australian soils are naturally low in nutrient concentrations, particularly nitrogen (N) and phosphorus (P). Native plants are well adapted to low-nutrient soils, and can be adversely affected when exposed to higher concentrations of nutrients. The Hawkesbury Sandstone soils in northern Sydney are naturally low in nutrients, but often receive additional nutrient input from urban stormwater run-off. Increases in soil nutrients in urban bushland are associated with the presence of exotic species, and the decline in the diversity of native species. This study tested the hypothesis that high conce

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Helbling, E. W., P. Carrillo, J. M. Medina-Sánchez, et al. "Interactive effects of vertical mixing, nutrients and ultraviolet radiation: in situ photosynthetic responses of phytoplankton from high mountain lakes in Southern Europe." Biogeosciences 10, no. 2 (2013): 1037–50. http://dx.doi.org/10.5194/bg-10-1037-2013.

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Abstract. Global change, together with human activities, has resulted in increasing amounts of organic material (including nutrients) that water bodies receive. This input further attenuates the penetration of solar radiation, leading to the view that opaque lakes are more "protected" from solar ultraviolet radiation (UVR) than clear ones. Vertical mixing, however, complicates this view as cells are exposed to fluctuating radiation regimes, for which the effects have, in general, been neglected. Furthermore, the combined impacts of mixing, together with those of UVR and nutrient inputs are vir

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Li, Yongfeng, Dongliang Xie, and Jing-An Cui. "The Effect of Continuous and Pulse Input Nutrient on a Lake Model." Journal of Applied Mathematics 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/462946.

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In an aquatic environment, a mathematical model consisting of nutrient, phytoplankton, and zooplankton has been considered, where excretion of zooplankton is considered as one of the sources of nutrient. We investigate the effect of the input rate of the limiting nutrient from outside on controlling algal bloom. First, we consider input limiting nutrient continuously, obtain the system has two boundary equilibria, and analyze the existence of the positive equilibrium by means of stability analysis, we get conditions for the stability of the equilibria. Then, we consider input limiting nutrient

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Hetling, Leo J., Norbert A. Jaworski, and David J. Garretson. "Comparison of nutrient input loading and riverine export fluxes in large watersheds." Water Science and Technology 39, no. 12 (1999): 189–96. http://dx.doi.org/10.2166/wst.1999.0546.

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An input-output mass balance watershed model was developed and tested on ten large benchmark watersheds in the northeastern United States. Inputs of chlorides, sulfates, potassium, phosphorus, and nitrogen were calculated from published census data on population, wastewater discharges, land use, air emissions, agriculture, forestry, and transportation. Attenuation factors were selected for the inputs, (for example, air deposition, fertilizer, point source discharges) and the average annual riverine export flux for the watersheds was calculated for the period from 1900 to 1995. Historic chlorid

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Ocimati, Walter, Jeroen C. J. Groot, Guy Blomme, et al. "A Multi-Objective Model Exploration of Banana-Canopy Management and Nutrient Input Scenarios for Optimal Banana-Legume Intercrop Performance." Agronomy 11, no. 2 (2021): 311. http://dx.doi.org/10.3390/agronomy11020311.

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Bananas on smallholder farmers in the African Great Lakes region are often pruned to illuminate shorter understory intercrops, reducing overall farm profitability. The impact of this practice on environmental and nutritional indicators are not known. This study determined the effect of this practice on operating profit, protein yield, soil organic matter (SOM) balance, and nitrogen input; and the management options for optimal performance of the intercrops. Alternative scenarios for improving soil nutrient balances of the system were also explored. Data from an experiment intercropping bush be

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