水稻根系营养吸收特性及其与干物质生产和稻米品质关系的研究

STUDIES ON THE RELATIONSHIP BETWEEN THE CHARACTERISTICS OF NUTRITION UPTAKE OF RICE ROOTS AND THE DRY MATTER PRODUCTION,GRAIN YIELD AND GRAIN QUALITY

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 intensity of N,P,K absorption of rice roots increased gradually with plant growth Itreached the peak during the panicle developing stage,then decreased.The uptake ration ofN,P,K was 4.89:1:7.43,The ratio of K increased after tillering stage. The uptake amount ofKdthe hybrid combination,Sanyou 63 was thegreatest among those of the tested varieties.There was a close correlation between the uptake ainount of N,P,K and the dry matter produc-tion and total carbohydrate. The protein content of rice was correlated with the uptake rate ofN after heading: