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Chemical differentiation and nitrogen transformations of some Wisconsin organic soilsIsirimah, Nnaemeka Ogu, January 1969 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1969. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
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Organic matter in sodic soils : its nature, decomposition and influence on clay dispersion /Nelson, Paul Netelenbos. January 1997 (has links) (PDF)
Thesis (Ph. D.)--University of Adelaide, Dept. of Soil Science, 1998? / Includes bibliographical references (leaves 147-170).
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The effect of fertiliser management practices on soil organic matter production in the semi-arid areas : a field and modelling approach /Georgis, Kidane. January 1997 (has links) (PDF)
Thesis (Ph.D.)--University of Adelaide, Dept. of Agronomy & Farming Systems, 1997? / Bibliography: leaves 155-169.
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Soil organic matter in Mediterranean and Scandinavian forest ecosystems : dynamics of organic matter, nutrients, and monomeric phenolic compounds /Faituri, Mikaeel Y., January 2002 (has links) (PDF)
Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv., 2002. / Härtill 4 uppsatser.
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The potential for root trait selection to enhance soil carbon storage and sustainable nutrient supplyMwafulirwa, Lumbani January 2017 (has links)
Plant roots are central to C- and N-cycling in soil. However, (i) plants differ strongly in tissue recalcitrance (e.g. lignin content) affecting their mineralization in soil, and (ii) rhizodeposits also vary strongly in terms of the metabolites that they contain. Therefore, (i) we used 13C labelled ryegrass root and shoot residues as substrates to investigate the impact of tissue recalcitrance on soil processes through controlled incubation of soil, (ii) we assessed variations in root C-deposition between barley genotypes and their respective impacts on soil processes using 13CO2 labelled plants, (iii) using 13C/15N enriched ryegrass root residues as tracer material, we investigated the impacts of barley genotypes on mineralization of recently incorporated plant residues in soil and plant uptake of the residue-derived N, and (iv) we applied a quantitative trait loci analysis approach to identify barley chromosome regions affecting soil microbial biomass and other soil and root related traits. In the first study, addition of root residues resulted in reduced C-mineralization rates, soil microbial activity and soil organic matter (SOM) priming relative to shoot residues. Planted experiments revealed (i) genotype effects on plant-, SOM- and residuederived surface soil CO2-C efflux and showed that incorporation of plant derived-C to the silt-and-clay soil fraction varied between genotypes, indicating relative stabilization of root derived-C as a result of barley genotype, (ii) that plant uptake of residue released N between genotypes was linked to genotype impacts on residue mineralization, and (iii) barley chromosome regions that influence plant-derived microbial biomass C. These results (i) suggest that greater plant tissue recalcitrance can lower soil C-emissions and increase C-storage in soil, and (ii) demonstrate the barley genetic influence on soil microbial communities and C- and N-cycling, which could be useful in crop breeding to improve soil microbial interactions, and thus promote sustainable crop production systems.
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Anthropogenic heavy metals in organic forest soils : distribution, microbial risk assessment and Hg mobility /Åkerblom, Staffan, January 2006 (has links) (PDF)
Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniversitet, 2006. / Härtill 4 uppsatser.
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