Titlebook: Nitrogen Economy of Flooded Rice Soils; Proceedings of a sym S. K. Datta (Head),W. H. Patrick (Boyd Professor) Conference proceedings 1986

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Reappraisal of the significance of ammonia volatilization as an N loss mechanism in flooded rice fio not disturb the field environment. This paper summarizes methodologies used in this research and discusses findings from recently conducted micrometeorological studies on ammonia volatilization. Factors affecting ammonia loss and the contribution of this process to the overall nitrogen loss from l

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Denitrification losses in flooded rice fields,conditions prevailing in flooded rice soils alter the rate at which these processes occur. The key N transformations in a flooded soil system include (1) mineralization of organic N; (2) nitrification of NH.; (3) NH. volatilization; (4) denitrification; and (5) N. fixation (Figures la, b). Agronomic

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The efficacy and loss of fertilizer N in lowland rice,s greatly increased the prospect of increasing yields, but this goal will not be reached without great increases in the use and efficiency of N on rice. Nitrogen enters a unique environment in flooded soils, in which losses of fertilizer N and mechanisms of losses vary greatly from those in upland s

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New developments in nitrogen fertilizers for rice, to rice-growing countries. The development of new N fertilizers is best achieved by following a logical sequence of testing and evaluation procedures in a variety of settings from the laboratory to the farmer’s field. Novel N fertilizers currently at various stages of testing include urea supergran

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Improving nitrogen fertilization in mechanized rice culture, relative to N source and time of application differs in the two systems because of the timing of soil submergence which influences N retention in the soil. Nitrogen management studies show that N fertilizer efficiency is maximized in water-seeded rice when ammonical N is placed 5 to 10 cm in the so

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