礫質灰色低地土長期田畑輸換復元田におけるコシヒカリの施肥窒素および土壌窒素の吸収

概要

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Uptake of soil nitrogen and fertilizer nitrogen were investigated in rotational paddy fields of gravelly gray lowland soils (Fluvisols) using the ^<15>N tracer technique. The experiment was conducted for 3 years comparing with continuous paddy fields. The results were summarized as follows ; In the rotated paddy fields that had been cultivated with barley and soybean for along period, the total amount of low layer nitrogen mineralized under submerged anaerobic incubation was not much larger than that of the continuous paddy fields. As for the subsoil nitrogen, it was the same relation with the plow layer. The rice plant of the rotated paddy fields absorbed more soil nitrogen than that of the continuous paddy fields, even when the amount of mineralized nitrogen of the former was not much larger than the latter. The recovery rates of mineralized soil nitrogen were also high for the rotated paddy fields than the continuous paddy fields. The average recovery rates of basal nitrogen and topdressed nitrogen at panicle formation stage in the rotated paddy fields were about 10% higher than that of the continuous paddy fields. Immobilization of fertilizer nitrogen to soil organic matter and "priming effect " of fertilizer nitrogen were small in the rotated paddy fields.
社団法人日本土壌肥料学会の論文
1992-10-05