Analysis on relation between the yield and the components of "Shanyou 63" under different yield levels
“汕优63”不同产量水平下增产因素分析

Hybrid rice,"Shanyou 63",of which the yields are from 7.1 to 15.5t/hm",is used to analyze the relation between the yield and its components,and its determinants.The results show that grain yield is mainly determined by the number of spikelets and filled grains per m2.When grain yield is less than 12t/hm2,it increases with the increase of spike-lets per panicle; when it is more than 12t/hm2,it increases with the increase of panicles per m".When the number of spikelets per m is less than 55000,the number of spikelets increases with the number of spikelets per panicle.Conversely,it increases with the number of panicles per m2.The relationship between weight of grains per panicle and the number of spikelets per panicle is of positive correlation.The weight of grains per panicle increases by 0.0241 g with the increase of one spikelet per panicle.