小区掉苗数对玉米杂交组合产量鉴定的影响

Effect of Missing Seedling Number on Yield Identification of Maize Hybrid Combinations

为明确玉米杂交组合小区比较试验中不影响产量鉴定的小区掉苗阈值,本试验以德美亚3号、鑫鑫1号和先玉335为材料,采用完全随机区组试验设计,分析小区不同掉苗梯度下,3个品种产量与小区株数的关系,利用回归分析,解析产量变化趋势,绘制密度-产量分布图。结果表明:德美亚3号、鑫鑫1号和先玉335高产理论最适密度分别为78 420、72 945和60 180株·hm^-2,对小区群体产量差异无影响的小区最大掉苗株数分别为5、5和3株。

In order to clarify the threshold of seedling miss in maize combination plots without affecting yield identification , this experiment used Demeiya 3 , Xinxin 1and Xianyu 335as materials , adopted complete random block design , analyzed the relationship between the yield of three varieties and the number of seedlings in plots with different seedling miss gradients , and used regression analysis to analyze the yield change trend , plotting density-yield distribution map.The results showed that the optimum theoretical densities of Demeiya 3 , Xinxin 1and Xianyu 335were 78 420 , 72 945and 60 180plants · hm^-2 , respectively.The maximum number of seedlings missed was 5 , 5and 3 , which had no effect on the difference of population yield.