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提高水稻的群体质量建立高产群体的目的就是要在足穗的基础上形成大穗，实现高产。然而穗数与大穗是一对矛盾。如何协调这对矛盾使之在足穗的基础上又使穗子尽可能大些，就成为水稻群体控制的难题，凌启鸿、苏祖芳等试验研究认为：在获得适宜穗数的前提下，控制无效分率、提高
Improve the Quality of Rice Population The purpose of establishing high-yielding population is to form large ears on the basis of enough ears to achieve high yield. However, the number of ears and ears is a pair of contradictions. How to coordinate these contradictions so as to make the ear bigger as possible on the basis of full ear becomes a difficult problem for rice population control. According to the experimental researches such as Ling Qihong and Su Zufang, under the precondition of obtaining suitable spike number, the control invalid rate ,improve