种植密度对玉米叶部性状及灌浆速率的影响

为了选育优良的耐密植玉米新品种,以玉米杂交种M103为试验材料,采用田间随机区组试验研究了5个种植密度对玉米叶面积(LA)、叶面积指数(LAI)、光合势(LAD)及灌浆速率的影响。结果表明:从6叶期到盛花期,随着种植密度的增加,玉米叶面积、叶面积指数、光合势的差异逐渐加大,单株叶面积和光合势随种植密度的增加而降低,群体叶面积、叶面积指数和光合势随种植密度的增加而升高。盛花期种植密度对叶面积、叶面积指数、光合势的影响达到最大。种植密度对玉米籽粒含水量和含水率的影响不明显,而对籽粒干重和灌浆速率有一定影响,低密度有利于籽粒干重的增加。种植密度对玉米灌浆前期的影响较大,后期相对较小,低密度下单株的灌浆速率较高,随着种植密度增加单株的灌浆速率有所下降。

Effects of Planting Density on Leaf Traits and Filling Velocity of Maize

In order to breed excellent maize variety resistant to close planting,taking hybrid corn M103 as material,a field randomized block test was conducted to study the effects of planting density on LA,LAI,LAD and filling velocity.The results showed that the difference of LA,LAI,and LAD increased with the increase of planting density from six-leaves stage to full-bloom stage.Population LA,LAI,and LAD got bigger with the increase of planting density.At full-bloom stage,the difference between five treatments reached maximum.Planting density had no significant effects on the content and ratio of water of maize kernel,but had certain effects on dry weight of kernel and filling velocity.The increase of dry weight of kernel was promoted by low density.The influence on dry weight was more obvious at the prophase of filling than at anaphase of filling.The filling velocity was bigger at low density than at high density.