水稲の理想的な窒素吸収パターンと土壌窒素無機化予測によるシステム施肥法

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The combination method of fertilizer application using the ideal nitrogen absorption pattern of paddy rice and estimation of soil nitrogen mineralization was investigated in the paddy field of Gley soil and Gray Lowland soil. The combination method of fertilizer application was defined, namely, shortage for the target amounts of nitrogen absorption was supplied at each growth stage. 1) It was considered that the suitable amounts of basal application were that which had the ideal nitrogen absorption at maximum tillering stage on the common weather years. The suitable mounts of basal application strongly correlated to the amounts of available nitrogen in the soil. It means that the suitable amounts of basal application could be decided by the amounts of available nitrogen. 2) The recovery rate of soil nitrogen by rice plants was as follows : 80% in the period from panicle formation stage to full heading stage ; 60% in the period from full heading stage to maturing stage in the well-drained paddy field ; 100% in both growth stages in the ill-drained paddy field. 3) The recovery rate of topdressing application by rice plants was measured using the ^<15>N tracer experiments in the experiments field. The recovery rate was concluded at 17 and 9 days before full heading stage. The recovery rate at each growth stage was 70 and 60% in both soil types. And the recovery rate was concluded at 4 days after full heading stage, it was 60% in both soil types. 4) The estimation of amounts of nitrogen absorption by rice plants was close to the actual measurement. It was suggested that the combination method of fertilizer application was appropriate. 5) The combination method of fertilizer application was checked by the actual experiments in both soil types. The results confirmed that the combination method was appropriate.
社団法人日本土壌肥料学会の論文
1991-12-05

水稲の理想的な窒素吸収パターンと土壌窒素無機化予測によるシステム施肥法

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