半干旱区玉米密度对产量及商品品质的影响

在吉林省西部半干旱区开展半干旱区玉米密度对产量及商品品质的影响研究。结果表明,半干旱区耐密型玉米品种郑单958、先玉335适宜播种密度在65000～75000株/hm²,稀植大穗型玉米品种吉单257、吉单137适宜播种密度在60000～65000株/hm²;郑单958、先玉335、吉单257、吉单137百粒重与密度呈负相关;4个品种的容重与密度关系呈二次抛物线,郑单958在50000株/hm²、先玉335、吉单257在57500株/hm²、吉单137在50000株/hm²时容重最高,商品等级最好;4个品种随播种密度增加,穗位叶叶绿素SPAD值降低。

Effect of Density on Maize Yield and Commercial Quality in Semi-arid Area

Field experiment was conducted in semi-arid area to evaluate the effects of density on yield and commercial quality of four maize hybrids, the results showed that the optimal planting density for high density tolerance maize varieties of Zhengdan958, Xianyu335 was from 65 000 to 75 000 plants/ha, and for large-size spike maize varieties of Jidan257, Jidan137 was from 60 000 to 65 000 plants/ha. There was a negative relationship between 100-kernel weight and density, and a quadratic parabola relationship between bulk density and density. In the optimum density of 50 000 plants/ha for Zhengdan958 and Jidan137, 57 500 plants/ ha for Xianyu335 and Jidan257, the bulk density was the highest among different planting densities. The weight of 100-kernel weight and test weight showed a negative correlation to density. The content chlorophyll content of ear leaves decreased with the density increased significantly.