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麦茬旱种水稻的植株地上部干物质累积量随生育期进展而增加,分配重心也随之由叶移至叶鞘,再移至穗。氮、磷的吸收累积规律各属急骤吸收型和持续缓慢吸收型,钾则介于二者之间。生长期氮多集中于叶,磷多分布于叶鞘,成熟时均多贮存于穗;而钾先由叶转至叶鞘,最终多贮存于茎秆。据分析,亩产稻谷250～350公斤的中产水平下,每亩水稻一生可吸收N5.5～6.5公斤,P_2O_51.5～1.9公斤,K_2O4.4～5.8公斤。
The dry matter accumulation of above-ground parts of dry-grown rice with wheat increased with the growth stage, and the distribution center of gravity also shifted from leaf to leaf sheath and then to ear. Nitrogen, phosphorus absorption and accumulation of the law are all sudden absorption type and sustained slow absorption type, potassium is in between the two. Nitrogen is more concentrated in the growth of leaves, phosphorus and more distributed in the leaf sheath, maturity are more stored in the ear; and potassium from leaf to sheath, and eventually more stored in the stalk. According to the analysis, under the middle level of 250-350 kg of mu per mu, rice can absorb N5.5-6.5 kg, P5.5-1.5 kg, K2O.4.4-5.8 kg per mu of rice in a lifetime.