种植密度对不同玉米品种农艺性状及产量的影响

为了更好地发挥优良玉米品种特性，设置了2个密度水平，对7个玉米品种进行耐密性评价。结果表明，增加密度对玉米的生育进程、出苗率、出苗整齐度无影响，对有效穗数、株高、穗位高、地上部第三节茎粗及穗部性状有显著影响。适度增加密度对不同品种产量均有一定的增加作用，但不同品种增加密度后增产表现差异较大，仲玉3号、绵单1256的适宜种植密度为5.25万株/hm²左右，中单901、绵单315稳产丰产性较好，适宜密度的弹性较大，密植可使二者获得更高的产量，协玉901、绵1304、蠡玉16号则需要适度密植。由此说明，合理密植是充分发挥品种特性、促进玉米增产挖潜的科学途径。

Effects of Planting Density on Agronomic Characters and Yield of Different Maize Varieties

In order to better play the characteristics of excellent maize varieties and provide reference for tapping the potential of maize yield, two density levels and seven maize varieties were set to evaluate density tolerance. The results showed that densification had no effect on growth process, seedling emergence rate and seedling emergence uniformity, but had significant indigenous effects on effective panicle number, plant height, panicle height, stem diameter of the third internode above ground and panicle traits. Moderate density increase has a certain gain effect on the yield of different varieties, but the performance of density increase and yield increase is quite different, suitable planting density of Zhongyu No. 3 and Miandan 1256 is about 3500 plants per mu, Zhongdan 901 and Miandan 315 had better stable yield and high potential yield, had large density elasticity, and better yields can be achieved by close planting, Xieyu 901, Mian1304, Liyu No. 16 need moderate dense planting. This shows that rational close planting is a scientific way to give full play to the maize variety characteristics and promote the yield increase and potential development.