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

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Adapting the potentially mineralizable N concept for the prediction of fertilizer N requirements,tion of the available N in soils is derived from the mineralization of organic matter. For decades, scientists have attempted to quantify the rate at which soils mineralize N, but the complexity of the N cycle has made this a major task. Further, agronomists have long sought soil test methods that a

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Field application of the 15N isotope dilution technique for the reliable quantification of plant-as the “N.-fixing” crop and a suitable non-N.-fixing control crop are grown in the same labelled soil and the .N enrichment of the control crop is assumed to be equal to the .N enrichment of the nitrogen (N) derived from the soil in the “N.-fixing” crop. In this case the proportion of unlabelled N bei

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,Nitrogen assimilation by legumes — processes and ecological limitations,ses ammonium is finally assimilated by the glutamine synthetase (GS)/glutamate synthase (GOGAT) system. NH . produced by nitrogenase in symbiosomes of legume nodules is released into the host cell cytosol where it is incorporated into amino acids and amides. The release of NH. into the cytosol appea

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Use of 15N for fertilizer N recovery and N mineralization studies in semi-arid Kenya,in microplots. There was no significant response in yield to fertilizer N and labelled N recovery was low, being 7.5% or less in one season and 17.7% or less in the second season. Samples of Kiboko soil at four different water contents were incubated and the rate of gross N mineralization over 7 day

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Significance of timing and method of N fertilizer application for the N-use efficiency in flooded t urea into floodwater between transplanting and early tillering which is a common practice of farmers. Losses appear predominantly during the first week after urea application. With broadcast and incorporation of N into soil at transplanting losses may be reduced but are still substantial. Deep plac

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Soil, plant and atmospheric conditions as they relate to ammonia volatilization,ctor determining air quality and acid rain deposition patterns. Redeposition of atmospheric NH. plays an important role in the N balance of natural ecosystems and has been implicated in forest decline, plant species change and eutrophication of surface water. Much of the N in soil-plant animal syste