Titlebook: Nitrogen Economy in Tropical Soils; Proceedings of the I N. Ahmad (Chairman, Organizing Committee) Conference proceedings 1996 Kluwer Acade

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Charles W. Rice,John L. Haviin,James S. Scheperspens that in the most ‘.’ (least .) .-worlds, . is also true. Another plausible interpretation of ‘.’ introduced in nonmonotonic reasoning dictates that . is true iff . is true in ‘.’ .-worlds. A formal account of ‘.’ in this .-based approach to default reasoning has been given through the usage of

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Forms and nature of organic N in soil,ts on microbial activity and nutrient availability. Typically, about one-third of the fertilizer N applied to temperate-zone soils is immobilized and retained in organic forms at the end of the growing season. A significant portion of this newly immobilized N is no more available to microorganisms a

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Seasonal fluctuations of native available N and soil management implications,ation reflects the net effect of inputs of N from mineralization, fertilizers and the atmosphere, and removal by plant uptake, immobilization, leaching and gaseous losses. The greatest concentrations normally occur during the transition between the dry and wet seasons. In East-Africa, up to 184 kg m

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Assessment of biological nitrogen fixation,eduction assay (ARA) technique, xylem-solute (or ureide production) method and the use of .N labelled compounds..The TND method relies on a control non-N.-fixing plant to estimate the amount of N absorbed by the fixing plant from soil. It is one of the simplest and least expensive methods, but works

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High productivity analysis of 15N and 13C in soil/plant research,les must be processed to integrate spatial variability. Soil scientists were first to recognise the need for a fast, easy-to-use .N analyser to replace the isotope ratio mass spectrometer (IRMS) and Kjeldahl-Rittenberg sample preparation. Development has since led to a variety of ‘continuous-flow’ m