Journal
SOIL SCIENCE AND PLANT NUTRITION
Volume 46, Issue 4, Pages 815-824Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00380768.2000.10409147
Keywords
fertilizer application; high-yielding cultivar; nutrient absorption; rice; yield
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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 (Ii) 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 IE 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 held.
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