Prediction of nitrogen availability and rice yield in lowland soils : nitrogen mineralization parameters

摘要: Field experiments were conducted under flooded soil conditions using Maahas clay amended with urea and rice straw-sesbania mixtures during the wet dry seasons. Parallel laboratory incubation tests done. The objectives 1) to determine N mineralization patterns establish relationship between parameters either availability or grain yield, 2) correlate results of organic studies in data from field experiments. soils followed a logistic function. In studies, potential was positively correlated extractable NH4+-N at end period (cumulative available N). Likewise, calculated uptake yield studies. Extractable (NH4++NO3−)-N laboratory. incubations 14 days after transplanting, panicle initiation, maturity also highly