花荚期灌溉对主茎型大豆籽实空间分布影响的初步研究

A PRELIMINARY STUDY ON GRAIN DISTRIBUTION OF MAIN-STEM TYPE SOYBEAN IN SOYBEAN CANOPY UNDER IRRIGATION IN FLOWERING AND POD-FILL STAGE

本文根据１９９３年的试验资料，分析了花美期灌水引起的土壤水分变化对东农４２号大豆籽实空间分布的影响，土壤水分为田间持水量的７３％至８４％时，结荚节位增加１．３个，荚、粒数最多，产量最高，荚、粒分布重心的高度最大，但分布重心在植株上的相对高度却最低；土壤水分上限为田间持水量的９０％的处理，有效节位数最少，节长增加０．８８—１．０６ｃｍ，荚、粒在植株上分布的密度比适量灌水时减小；土壤水分为田间持水量的６７％至７６％时，荚、粒分布的重心最低，但分布重心在植株上的相对高度最大。

By use of the experiment data from 1993,this paper analyzed distributional feature ofDongnong 42 soybean grain in soybean canopy under different soil moisture in flowering andpod-fill stase.Where soil moisture was 73-84% of the field capacity,number of podednode increased 1.3,the numbers of pod and seed were the most,and yield was the most.Thedistribution centers of pod and seed under the soil moisture were the tallest,then the proportions of the distribution center to height of plant were the lowest. Where soil moisture uf limit was 90% of field capacity, number of effective node decreased ,Length between two nudesincreased 0.88-1. 06 cm,and distribution dellsities of pod and seed were lower than wheremoisture was moderate. Where soil moisture was 67-76% of the field capacity,d distributioncenters of pod and seed were the shortest,but the proportions of the distribution center toheight of plant were higher than where moisture was moderate.