Soil properties effects and management of organic residues to improve C sequestration, reduce N losses and improve crop yield

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dc.contributor.authorMugwe, J. N.
dc.contributor.authorDanga, B. O.
dc.contributor.authorMochoge, B. O.
dc.contributor.authorGetenga, Z.
dc.date.accessioned2014-07-08T12:23:19Z
dc.date.available2014-07-08T12:23:19Z
dc.date.issued2010-09
dc.description.abstractRates of decomposition of organic materials in soil determine the amount of carbon (C) which is mineralized and released as CO2 versus the amount of C that is retained in various forms in the soil. Decomposition rates also greatly influence the amount of nitrogen (N) which becomes available for plant uptake or susceptible to leaching versus that which is retained in SOM or lost via gaseous emission. The processes that follow the decomposition of residues by microorganisms are strongly influenced by soil chemical and physical properties, and also by plant roots via the processes of mineral N uptake, respiration, exudation and decay. The equilibrium between carbonates, bicarbonates, CO2 and pH controls inorganic C losses and deposition over large areas of arid and semi arid climates and should be linked to the biological cycle of C. However, few quantitative relationships between decomposition rates of organic manures & wastes (OW) and controlling edaphic, climatic and biotic variables have been determined. The overall objective of this proposal is to explore the effects of soil properties and management practices on C sequestration in soils, off-site losses of N and crop productivity. We hypothesized that organic waste decomposition is a biological process controlled by the microorganism population and it is not affected by soil properties, and that sequestration of CO2 -C by inorganic components of the soil may be a considerable process in calcareous soils. The methodology includes the simultaneous use of laboratory and field experiments with stable isotopes of N and C to follow the dynamics of N and C. Best management practices will be identified by field experiments and simulation scenarios with the process oriented computer simulation models of N and C transformations in a soil-OW-plant system (NCSOIL) and two MSc students will be trained.en_US
dc.identifier.citationSecond RUFORUM Biennial Regional Conference on" Building capacity for food security in Africa", Entebbe, Uganda, 20-24 September 2010.en_US
dc.identifier.urihttp://www.ruforum.org/sites/default/files/file/Biennual%202010/Soil%20and%20Water%20Management/Danga.pdf
dc.identifier.urihttp://ir-library.ku.ac.ke/handle/123456789/10329
dc.language.isoenen_US
dc.subjectOrganic wastes (OW)en_US
dc.subjectN & C cyclingen_US
dc.subjectNCSOILen_US
dc.subjectmodelingen_US
dc.subjectC- sequestrationen_US
dc.subjectClimate Changeen_US
dc.subjectfood securiten_US
dc.titleSoil properties effects and management of organic residues to improve C sequestration, reduce N losses and improve crop yielden_US
dc.typePresentationen_US
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