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The fate of fertilizer nitrogen applied to paddy fields and its absorption by the rice plant. 1. Absorption of basal nitrogen by rice plants



The fate of fertilizer nitrogen applied to paddy fields and its absorption by the rice plant. 1. Absorption of basal nitrogen by rice plants



Proceedings of the Crop Science Society of Japan, 40: 3, 275-280



In experiments in 1969-70, rice plants were transplanted in early or late May and given basal dressings of 60-70 or 150 kg N/ha as 15N-labelled ammonium sulfate. Uptake of fertilizer N had almost ceased by late June, after which time plants absorbed soil N. Fertilizer N: total N absorption ratios were highest soon after transplanting and were highest in plots given 150 kg/ha. N recoveries were 22% in 1969 and 26-27% in 1970.

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