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研究表明水稻根系Ｎ，Ｐ，Ｋ日吸收强度随生育进程而逐渐增大，至穗分化期至抽穗期达到高峰，而后下降：Ｎ，Ｐ，Ｋ吸收比例平均为４．８９：１：７．４３，自分蘖盛期以后，Ｋ素吸收比例上升，杂交稻组合汕优６３吸Ｋ比例大。根系的Ｎ，Ｐ，Ｋ吸收量与稻株干物质生产和总糖生产呈极显著相关；稻米蛋白质含量与抽穗后的Ｎ素吸收速率呈显著相关。
The results showed that the absorption intensity of N, P and K in rice roots gradually increased with the growth of rice and peaked at the stage of spike differentiation to heading, and then decreased. The average absorption ratio of N, P and K was 4.89: 1: 7. 43, after the tillering stage, the ratio of K uptake increased, and the proportion of K in hybrid rice combination Shanyou 63 was large. The N, P and K uptake of roots was significantly and significantly correlated with the dry matter production and total sugar production of rice plants. The protein content of rice was significantly correlated with the N uptake rate after heading.