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Dissertations / Theses on the topic 'Soils and crops'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Isaac, Gura. "Crop rotation and crop residue management effects under no till on the soil quality of two ecotopes in the Eastern Cape, South Africa." Thesis, University of Fort Hare, 2016. http://hdl.handle.net/10353/2934.

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The degradation of soil quality due to undesirable farming practices has reached alarming scales in the Eastern Cape and this has had negative repercussions on soil productivity and the environment in general. There is growing evidence that conservation agriculture (CA) practices involving minimal mechanical disturbance, maintaining permanent surface cover and embracing diverse crop rotations increase soil organic carbon (SOC) and therefore has potential to mitigate soil quality deterioration. A study was carried out at two sites located in two ecotopes to investigate the effects of crop resid

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2

Kerr, John. "Phytoremediation of metal-contaminated soils by industrial crops." Thesis, University of Glasgow, 2003. http://theses.gla.ac.uk/5369/.

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Linum usitatissimum (flax), Brassica napus var. oleifera (oilseed rape), Miscanthus x giganteus (miscanthus) and Urtica dioica (nettle) were investigated to assess their potential as phytoremediation crops. Germination experiments using flax and oilseed rape established that seedling germination was not inhibited by exposure to metals in solution except at the highest concentrations considered. Germination was, however, not a reliable indicator of plant metal tolerance as metal toxicity to emerged seedlings was evident in contaminated soil treatments exhibiting good germination rates. Four pla

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3

Alexander, Paul. "The responses of crops and soils to calcified seaweed." Thesis, University of Wolverhampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323090.

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4

Farhoodi, Alireza. "Lime requirement in acidifying cropping soils in South Australia." Title page, table of contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phf223.pdf.

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"August 2002" Bibliography: leaves 230-254. Field sites and soils from cropping studies in the mid-north of South Australia were used to address questions of soil responses to lime and the influence of acidifying inputs. The study showed that LMWOAs associated with different stubbles can help to ameliorate toxicity through complexation with A1.

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5

Holland, Jonathan Eddison. "Changes in soil physical properties under raised bed cropping /." Connect to thesis, 2006. http://eprints.unimelb.edu.au/archive/00002537.

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6

Mupambwa, Hupenyu Allan. "Winter rotational cover crops effects on soil strength, aggregate stability and water conservation of a hardsetting cambisol in Eastern Cape Province, South Africa." Thesis, University of Fort Hare, 2012. http://hdl.handle.net/10353/453.

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Winter rotational cover crops (WRCC) are often used to boost soil fertility and plant nutrition. However, selection and use of WRCC for soil physical improvement is usually overlooked. The objective of this study was to determine the effects of WRCC on soil strength, aggregate stability and water conservation of a hardsetting soil. The soil physical properties were determined after four rotations of growing monocultures of vetch (Vicia dasycarpa cv. Max), lupin (Lupinus angustifolius cv. Tanjil) and oats (Avena sativa cv. Sederberg) and after two rotations of growing bicultures of oats (Avena

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7

Leiva, Soto Andrea S. "Effects of Soil Balancing Treatments on Soils, Vegetable Crops and Weeds in Organically Managed Farms." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu151514193894181.

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8

Isse, Abdullahi. "Capacity of cover crops to capture excess fertilizer and maintain soil efficiency." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0021/MQ37132.pdf.

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9

Sui, Xiaolin. "Screening forage crops suitable for remediating P-impacted soils in Florida." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0025062.

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10

Wimaladasa, G. D. "Some aspects of the chemistry and mineralogy of soil potassium in Sri Lankan acid tea soils and Scottish soils under a range of crops." Thesis, University of Aberdeen, 1989. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU020940.

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The Sri Lankan acid tea soils, collected from six different agro-ecological regions and from the long-term field experiments in St. Coombs, were subjected to a detailed mineralogical investigation with particular reference to the understanding of the chemistry of soil potassium and K fertiliser applications. These extremely weathered soils contained predominantly kaolinite, Al-chlorite, gibbsite and goethite, but K-fixing minerals like smectite and vermiculite were absent. Small quantities of micaceous minerals were only found in the fine and coarse sand fractions of these soils, except in the

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11

Doel, J. M. "Accumulation and recovery of nitrogen in mixed farming systems using legumes and other fertility building crops." Thesis, Coventry University, 2012. http://curve.coventry.ac.uk/open/items/9dd4b790-1672-4b0e-9104-09439ddde7a2/1.

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Fertility-building crops (FBCs) offer the opportunity to alleviate the costs of inorganic fertiliser by providing an alternative supply of available nitrogen (N) in soils. A survey of relevant literature reviewed the types of FBCs, their nitrogen accumulation potentials, residue characteristics, and subsequent release patterns. It also identified a paucity of data concerning the response of different species to UK climatic, soil, and management conditions. In order to investigate these relationships further pot and field trials were established in 2007 at the Royal Agricultural College, Cirenc

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12

González-Lerma, Victoria Elizabeth. "Hydroponic production of selected flower and herb crops in red lava rock." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10597.

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Thesis (M.S.)--West Virginia University, 2009.<br>Title from document title page. Document formatted into pages; contains xiii, 178 p. : ill. (some col.), maps (some col.). Includes abstract. Includes bibliographical references (p. 112-115).

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13

Clark, Louise Jayne. "Changes in properties of vineyard red brown earths under long - term drip irrigation, combined with varying water qualities and gypsum application rates." Title page, table of contents and summary only, 2004. http://hdl.handle.net/2440/37808.

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Irrigation water of poor quality can have deleterious effects on soils. However, the effect of drip irrigation on seasonal and long term (e.g. over 50 years) changes in soil chemical properties is poorly understood, complicated by the two-dimensional water flow patterns beneath drippers. Field and laboratory experiments were conducted, along with computer modelling, to evaluate morphological and physio-chemical changes in a typical Barossa Valley Red Brown Earth (Palexeralf, Chromosol or Lixisol) when drip irrigated under various changing management practices. This work focused on the followin

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14

Thomas, Benjamin Mark. "The role of vesicular-arbuscular mycorrhizal fungi in Linum usitatissimum L. production in Southern Australian soils." Title page, contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09pht4541.pdf.

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Bibliography: leaves 106-132. This project investigated the role of VAM fungi in the growth and nutrition of Linum usitatissimum L. in agricultural soils in southern Australia. It had two general aims: (1) to examine the role of indigenous VAM fungi in the growth and nutrition of linseed in field soil collected near Clare, South Australia; and (2) to examine the effect of VAM fungi on the Zn nutrition of Linola.

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15

Angers, Denis Arthur. "The effects of cropping on aggregation and carbohydrates of a Kamouraska clay soil /." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75869.

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The main objective of this research was to determine the short-term effects of cropping on the aggregation and the carbohydrate fraction of a marine clay soil. When compared to a fallow (bare soil) control, cropping to barley and alfalfa for two seasons resulted in significant increases in the size and stability of soil aggregates. The increase in water-stable aggregates $>$2.0 mm was at the expense of aggregates $<$1.0 mm. Under corn, soil aggregation was not different than under fallow. After two seasons, soil under barley or alfalfa contained 15 to 25% more carbohydrates than the fallow or

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16

Nafuma, Leonard Simiyu. "Short-term effects of graminaceous cover crops of autumn soil mineral nitrogen cycling in western Lower Fraser Valley soils." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27210.pdf.

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17

Poulter, Rachel. "Investigating the role of soil constraints on the water balance of some annual and perennial systems in a Mediterranean environment /." Connect to this title, 2005. http://theses.library.uwa.edu.au/adt-WU2006.0018.

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18

Andrews, Lisa M. "Loblolly pine response to drainage and fertilization of hydric soils." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-12162009-020152/.

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19

Furniss, Caroline S. M. "NaCl-regulated gene expression in Distichlis spicata." Thesis, Durham University, 1994. http://etheses.dur.ac.uk/5833/.

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NaCl-induced and -repressed cDNA clones had previously been isolated by differential screening of a cDNA library, prepared from poly(A(^+)) RNA isolated from Distichlis spicata (salt grass) cell cultures grown in the presence of 260 mM NaCl (Zhao, et al., 1989). Eight of these cDNA clones have now been subcloned and/or sequenced and the predicted polypeptides compared with owl sequence data base. Three clones pDZ6.2, pDZVIII 1.2.1 and pDZIX 3.1 encode proline rich proteins, containing an amino acid repeat [PPKKDH(H)Y(Y)]. They have similar amino acid usage to proline-rich cell wall proteins, b

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20

Njaimwe, Arnold Ngare. "Tillage and crop rotation impacts on soil, quality parameters and maize yield in Zanyokwe Irrigation Scheme, South Africa." Thesis, University of Fort Hare, 2010. http://hdl.handle.net/10353/460.

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Intensive tillage and monoculture cropping practices reduce soil C accumulation hence increasing soil vulnerability to chemical, physical and biological degradation. This study focussed on enhancing biomass production of wheat and oat winter cover crops as a means of increasing C sequestration in the low organic C soils of the central part of Eastern Cape Province. The specific objectives were (i) to evaluate the short-term effects of no till and cereal-fallow based crop rotations on; soil organic matter related parameters, pH and electrical conductivity, (ii) soil bulk density, water retentio

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21

Chataway, Robert G. "Sustaining soil resources on dairy farms based on crops in southern Queensland /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18581.pdf.

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22

Plotkin, Jeremy Barker. "The Effects of Green Manure Rotation Crops on Soils and Potato Yield and Quality." Fogler Library, University of Maine, 2000. http://www.library.umaine.edu/theses/pdf/PlotkinJB2000.pdf.

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23

Kim, Kyoung-Woong. "Influence of uraniferous black shales on trace elements in soils and crops in Korea." Thesis, Imperial College London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284526.

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24

Lawgali, Youssef F. "Trace element levels in Mediterranean grains." Thesis, University of Aberdeen, 2010. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=136842.

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This is the first study to compare total arsenic (As) and other trace elements in the agricultural soils and grain of Eastern, Western and Southern Libya, North Africa and the Middle East (NA & MIDEA). Soil pot experiments and field experiments were conducted to determine the levels of As within wheat grains in Libya. In the soil pot experiments, wheat genotypes were planted in similar soils and yet differences in grain As concentration were found among the cultivars. The highest As accumulation was found in <i>T. durum; </i>however, in the field data the highest levels were found in <i>T.

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25

You, Rui. "The occurrence of contaminants in crops grown under organic soil amendments and peri-urban soils: phytotoxicity and human health implications." Doctoral thesis, Universitat Autònoma de Barcelona, 2021. http://hdl.handle.net/10803/671348.

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L’agricultura moderna ha estat buscant contínuament mètodes efectius per satisfer la demanda d’aliments que augmenta exponencialment a nivell mundial. L’aplicació de residus orgànics com a fertilitzants o esmenes de sòl és una mesura molt utilitzada, ja que subministra nutrients de manera eficient i ràpida als cultius. De fet, des de 2015, la Comissió Europea ha proposat un pla d’economia circular que fomenta la utilització de biosòlids. No obstant això, la presència d’una àmplia gamma de contaminants com elements traça (ET), contaminants orgànics i contaminants emergents com antibiòtics (AB)

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26

Montagu, Kelvin D. "Whole plant response to soil compaction : from field practices to mechanisms /." View thesis View thesis, 1995. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030522.092251/index.html.

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27

Brink, Daan. "Die effek van verskillende oppervlakbewerkingspraktyke op die wortelverspreiding van wingerd." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/381.

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28

Khan, Javed Ahmad. "Salinity effects on 4D recombinant tetraploid wheat genotypes." Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321525.

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29

Lenis, Julian Mario. "Physiological traits underlying differences in salt tolerance among glycine species." Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/5646.

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Thesis (M.S.)--University of Missouri-Columbia, 2008.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 13, 2009) Includes bibliographical references.

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30

Nciizah, Adornis Dakarai. "Cattle manure, scalping and soil wetness effects on some physical properties of a hardsetting soil and associated early maize growth." Thesis, University of Fort Hare, 2011. http://hdl.handle.net/10353/349.

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Most soils in the Eastern Cape Province, South Africa are shallow and are low in organic matter. Therefore these soils are structurally fragile and highly susceptible to inherent degradative processes like hardsetting. The objective of this study was to determine the effect of cattle manure, scalping and soil wetness on aggregate stability, penetration resistance and early maize growth in hardsetting soils. Glasshouse and field studies were conducted to determine the effect of cattle manure on aggregate stability and penetration resistance of freshly exposed topsoils by scalping at 0, 10 and 2

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31

Fletcher, Cheryl Florence. "Spatial variability of weeds, soils and crops in fields of the south Peace River region, Alberta." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ40049.pdf.

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32

Ghomsheh, Habib Nadian. "Effects of soil compaction on growth and P uptake by Trifolium subterraneum colonised by VAM fungi /." Title page, Contents and Summary only, 1997. http://web4.library.adelaide.edu.au/theses/09ASOP/09asopg427.pdf.

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33

Teklay, Tesfay. "Organic inputs from agroforestry trees on farms for improving soil quality and crop productivity in Ethiopia /." Umeå : Dept. of Forest Ecology, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/2005122.pdf.

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34

Botha, Elizabeth Johanna. "Estimating nitrogen status of crops using non-destructive remote sensing techniques." Thesis, University of Limpopo, 2001. http://hdl.handle.net/10386/2562.

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35

Forsberg, Sverker. "Behaviour of ¹³⁷Cs and ⁹⁰Sr in agricultural soils : influence of ageing and soil type on availability, migration and plant uptake /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2000. http://epsilon.slu.se/avh/2000/91-576-5735-1.pdf.

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36

Wu, Aisheng. "Testing and development of the Canadian Land Surface Scheme (CLASS) for forests, agricultural crops and bare soils." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0018/NQ46452.pdf.

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37

Crosier, Joshua D. "Agricultural Utilization of Brewers’ Spent Grains & Sawdust: Effects on Fertility of Soils and Productivity of Crops." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1417788956.

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38

Sheldon, Bonita Joy. "Heavy metal uptake and accumulation in agricultural crops in urban areas of the Western Cape." Thesis, Cape Peninsula University of Technology, 2005. http://hdl.handle.net/20.500.11838/2006.

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Thesis (MTech (Physical Sciences))--Cape Peninsula University of Technology, 2005.<br>A research study into heavy metals in the Cape Town area, found significant amounts of potentially toxic metals such as lead, cadmium, chromium and iron leaching into the underground aquifer. A further additional study conducted on a community garden in Khayelitsha, showed that vegetable crops have the tendency to accumulate certain heavy metals if they are present in soil and water resources. This study was centered around the Philippi Horticultural Area, which is a large significant farming ar

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39

Venter, Annari. "Comparing plant yield and composition with soil properties using classical and geostatistical techniques." Diss., University of Pretoria, 2003. http://hdl.handle.net/2263/23916.

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Plant nutrient management plays a vital role in the success or failure of modern Lucerne production. In South Africa, Lucerne is produced under a wide range of climatic conditions, under dryland and irrigation and in some areas throughout the year. This means that there is a continuous demand for nutrients under a wide range of environmental conditions. The most important factors affecting the nutrient requirement of Lucerne is yield, the cutting schedule, climate and management practices. To enable site-specific crop requirements, the spatial variation of soil and plant properties within a fi

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40

Cerqueira, Francisco Diogo de Almeida. "Influence of agricultural practices on the microbiome and the antibiotic resistance gene complement in soils, plants, and crops." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/669200.

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Antibiotic (AB) Resistance is an increasing global problem for public health, with multi-resistant bacteria persisting and spreading not only in clinical settings but also in the environment. One of the possible vectors of this spread is the use and re-use of waste water (WW) and of manure and sludge from WW treatment plants (WWTPs) in different agriculture practices (irrigation, soil amendment). These practices are becoming widespread in regions with scarcity of water. WWTPs are known as AB resistance hotspots, whereas soil amendment by organic fertilization is known to increase AB resistance

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41

Jacobs, Johan Adolf. "Karakterisering van derivate uit 'n Thinopyrum distichum X tetraploïede rog kruising." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52904.

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Thesis (MSc)--University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: Soil salinity is a major limiting factor of plant and crop growth, because the absorption of water and nutrients is such a complex process while low and moderate salinity are omnipresent. Plant growth is affected negatively if a specific ion concentration exceeds its threshold and becomes toxic. The detrimental effect of soil affected by salt on crop production is increasing worldwide (Tanji, 1990). The level to which plants can tolerate high salinity levels is genetically controlled with several physiological and genet

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42

Arango, Argoti Miguel Andres. "Nitrous oxide emissions: measurements in corn and simulations at field and regional scale." Diss., Kansas State University, 2013. http://hdl.handle.net/2097/16680.

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Doctor of Philosophy<br>Department of Agronomy<br>Charles W. Rice<br>Nitrogen is critical for plant growth and is a major cost of inputs in production agriculture. Too much nitrogen (N) is also an environmental concern. Agricultural soils account for 85% of anthropogenic N₂O which is a major greenhouse gas. Management strategies for N fertilization and tillage are necessary for enhancing N use efficiency and reducing negative impacts of N to the environment. The different management practices induce changes in substrate availability for microbial activity that may result in increasing or r

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43

Collins, Shane. "Residue composition influences nutrient release from crop residues." University of Western Australia. School of Earth and Geographical Sciences, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0171.

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[Truncated abstract] A greater adoption of stubble retention, minimum-till and no-till farming practices for the purposes of conserving soil, water and fertility requires a greater understanding of the complexity of physical and chemical interactions between the soil and crop residues. There is currently insufficient knowledge to allow reliable predictions of the effects of different residue types in different environments on soil fertility and crop growth, owing to the many residue characteristics and environmental interactions that have been shown to affect decomposition or nutrient release.

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44

Araujo, Eloá Moura. "Bioconcentration and desorption kinetic of potentially toxic elements in soils cultivated with horticultural crops in organic and conventional systems." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-18052018-114411/.

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Potentially toxic elements (PTEs) can be absorbed and accumulated in vegetables organ and tissues, and this is an important channel through which PTEs can enter into the food chain. Soil management may interfere in the behavior of PTEs in the system. So, the study of the dynamics of elements in the soil is fundamental to a better understanding of factors that influence soil-plant transfer. In the state of Pernambuco, Brazil, the production of vegetables is mainly concentrated in small or medium organic and conventional farms located in the Agreste and Sao Francisco regions. Our aims in this re

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45

AMARAL, ROMILTON dos S. "Dose na populacao da regiao urano-fosfatica pernambucana devido a presenca de uranio e Rasup226 nos cultivares." reponame:Repositório Institucional do IPEN, 1994. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10409.

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Made available in DSpace on 2014-10-09T12:38:21Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:04:57Z (GMT). No. of bitstreams: 1 05676.pdf: 7442847 bytes, checksum: 3c455d156137c95f8d09a280b3d10f5c (MD5)<br>Tese (Doutoramento)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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46

Paull, Jeffrey Gordon. "Genetic studies on the tolerance of wheat to high concentrations of boron." Title page, contents and abstract only, 1990. http://hdl.handle.net/2440/37778.

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This thesis describes studies into the genetic control of tolerance of wheat to high concentrations of boron ( B ). Initially, experiments were conducted to determine selection criteria for distinguishing between tolerant and sensitive genotypes for both glasshouse and field grown wheat. Responses of plants to high concentrations of B, under glasshouse conditions, included reduced vigour, delayed development, expression of symptoms of toxicity and reduced grain and total dry matter yields. Significant differences between tolerant and sensitive genotypes resulted for all parameters, however the

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47

Amadori, Caroline. "Agregação e proteção física da matéria orgânica em Latossolo Vermelho sob plantas de cobertura de inverno e sistemas de preparo do solo em experimento de longa duração." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/1094.

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CAPES CNPq<br>Os sistemas de manejo do solo promovem alterações à agregação e ao estoque de matéria orgânica do solo (MOS). O objetivo foi avaliar a influência do cultivo de plantas de cobertura de inverno e de sistemas de preparo à agregação e ao estoque de carbono (C) no solo e nas frações da MOS. O experimento teve início no ano de 1986 no Instituto Agronômico do Paraná, em Pato Branco, sobre um Latossolo Vermelho aluminoférrico. Os tratamentos são uma combinação entre plantas de cobertura de solo: aveia preta, centeio, ervilhaca comum, ervilhaca peluda, nabo forrageiro, tremoço azul, trig

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48

Milham, Paul J. "The behaviour of cadmium in soil." View thesis, 2008. http://handle.uws.edu.au:8081/1959.7/39519.

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Thesis (Ph.D.) -- University of Western Sydney, 2008.<br>A thesis submitted to the University of Western Sydney, College of Health and Science, Centre for Plant and Food Science, in fulfilment of the requirements for the degree of Doctor of Philosophy. Includes bibliographical references.

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49

MacDonald, Tim. "The effects of excessive liquid hog manure applications on phosphorus concentrations in soil and surface runoff from corn and forage crops." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0033/MQ64398.pdf.

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50

Sänger, Anja [Verfasser]. "Application of biogas slurries from energy crops to arable soils and their impact on carbon and nitrogen dynamics / Anja Sänger." Kassel : Universitätsbibliothek Kassel, 2012. http://d-nb.info/1029215154/34.

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