日照,ケイ酸施用,降下浸透が水稲の穂肥窒素利用率に及ぼす影響

概要

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Recovery rate of topdressed nitrogen at panicle formation stage of rice was determined by using the ^<15>N tracer technique for gravelly gray lowland soils (Fluvisols). Effects of shading (reduction of solar radiation : 20-40%), and application of calcium silicate (200, 400 m g^<-2>) or potassium silicate (100 g m^<-2>) on the recovery rate were investigated for the 30×30 cm quadrate established in the experimental plots. Effects of percolation rate (0, 2 cm d^<-1>) was slso investigated by using wagner pots (a/5000). The results were summarized as follows : Recovery rate of fertilizer nitrogen in rice plant with shading was 10 % lower than that of the control. The recovery rate also decreased by 15-20 % with application of calcium silicate or potassium silicate. Calcium silicate and potassium silicate seemed to enhance denitrification of fertilizer. Percolation rate at the 2 cm d^<-1> increased the recovery rate by 20 %.
社団法人日本土壌肥料学会の論文
1993-12-05