不同播种密度对地膜小麦重要农艺性状的影响

在天水地区大田设置6个播量水平，观测不同密度条件下地膜小麦群体重要农艺性状的变化规律，并与露地小麦相对照。结果表明：单株分蘖数、最高总茎数、基部节间长度是有规律的增加；地膜小麦的单株分蘖数、最高总茎数的变幅较小，而露地小麦的变幅较大；基部节间长度随密度的增加而增加，地膜小麦的增长较快；单位面积有效穗数、穗粒数、千粒重、单位面积上的产量均随密度的变化而变化，但地膜小麦的变幅较小，而露地小麦的交幅较大；叶面积指数、叶片功能期，地膜小麦和露地在密度交化过程中表现出相同的趋势；籽粒饱满指数随密度增加而降低，二者有相同的趋势。而粒叶比则露地小麦的变幅较大；倒伏程度以露地小麦的变幅较大。

Effect of different planting density on the main agronomic traits of film-mulched wheat

To further learn about the effect of different planting density on the agronomic traits of plastic film-mulched wheat,we have done some research on different groups of film-mulched wheat to find out what the transformation rules of their agronomic traits are.The result indicated that the single tiller number,the highest total stems and the distance between plots all increased regularly;Plastic film-mulched wheat was smaller than non-film-mulched wheat in the transformation range of single tiller number and the highest total stems.Along with the increasing of density,film-mulched wheat was bigger in the increasing of the distance between plots;The effective ears per area,ears and grains,1000grain-weight and per unit yield all changed along with the changing of density, and the transformation of film-mulched wheat was smaller than the non-film-mulched wheat;Both leaf area index and leaf blade function date are changing as the changing of density;and the film-mulched wheat and non-film-mulched wheat show the same tendency during the course of transformations.The grain plump index of the non-film-mulched wheat cut down with the increasing of density as well as film-mulched wheat.The non-film-mulched wheat was bigger on both the transformation range of the rate of grains and the transformation range of leaves and lodging degrees.