种植密度对玉米耐密性状的影响

Effects of Planting Density on Density Tolerance Characters of Corn

[目的]研究种植密度对玉米耐密性状的影响。[方法]以郑单958和华美1号为试验材料,研究了种植密度对植株冠层透光率、穗位叶夹角、穗位叶片厚度和叶绿素含量、产量及其构成因素的影响,并对玉米主要形态指标进行了相关性分析。[结果]适合密植的品种有以下特点:在灌层中下部透光系数较好;叶片夹角也随着种植密度增加而减小,而且响应灵敏;穗位叶片厚度和叶绿素含量较大;产量峰值出现在高密度的情况下。因此华美1号更适合密植。[结论]该研究为耐密型玉米品种的选育提供方向。

[Objective] To research the effects of planting density on density tolerance characters of corn.[Method] With Zhengdan 958 and Huamei 1 as the test materials,we researched the effects of planting density on light transmittance coefficient of canopy,ear leaf angle ,ear leaf thickness,chlorophyll content,yield and its component factors.The correlation analysis of corn major morphological indexes was carried out.[Result] Varieties suitable for dense planting had the following characteristics： the light transmittance coefficient in the lower part of the canopy was better; the leaf angle decreased with the increase of planting density,and the response was sensitive; the leaf thickness and SPAD value were larger; the peak yield appeared under high density.Thus,the characteristics of Huamei 1 were more suitable for dense planting.[Conclusion] This research provided breeding direction for corn variety with density tolerance.