Macro-Element Absorption at Maturity in Relation to Grain Yield in High-Yielding Rice Cultivars

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By applying nitrogen (N) and phosphorus (P) fertilizers at different rates and times to high-yielding rice cultivars, we determined the absorption of N, P, and potassium (K) in relation to the grain yield. The results showed that, at a higher top-dressing rate of N, the grain yield increased and the absorption of N, P, and K was stimulated, whereas top-dressing of P did not significantly increase the grain yield and nutrient absorption. The absorption of N, P, and K differed markedly among the cultivars, even at the same level of grain yield in the same field (for Yangdao 4 and Suweon 258). N absorption in line 9004 was 29.2 g m^<-2> for a paddy grain yield of 1,250 g m^<-2> (brown rice: about 1,000 g m^<-2>), being much higher than the value reported in the literature. The ratio of N: P: K absorption at different yield levels revealed that, with the increase of grain yield of the cultivars, the absorption of P and K relative to the absorption of N decreased. The absorption amounts and ratios of N, P, and K depended on the cultivars, yield levels, and possibly, soils of the field.
社団法人日本土壌肥料学会の論文