重迎茬大豆施用促根剂效果分析

促根剂的田间小区试验和大面积推广示范试验结果表明：促根剂显著促进了重迎茬大豆苗期和花荚期植株地上部和根系的生长发育，其株高、根长、地上部和根系鲜重及根瘤重都较对照增加，特别是对根系生长的影响尤为显著，增加幅度在10％以上；促根剂提高了大豆叶片的光合作用，使干物质积累增加，表现在大豆叶面积比对照增大；在不同茬口的土壤上，促根剂的效果表现不尽一致，总体趋势为重1＞迎茬＞重2＞正茬；促根剂显著增加了大豆植株的总粒数，使重迎茬大豆产量比对照提高，增产幅度在10％以上。

Effect Analysis of Root Growth Promoting Agent on Continuous Cropping and Alternate Cropping Soybean

Study on Root Growth Promoting Agent was conducted under field plot experiment and large area demonstration experiment. The results showed that Root Growth Promoting Agent could promote shoot and root growth of continuous cropping and alternate cropping soybean plants significantly at seedling, flowering and podding stages. Plant height, root length, shoot fresh weight, root fresh weight and root nodule weight all increased compared with control. The effect on root growth was most significant, with a increase over 10%. The agent enhanced photosynthesis of soybean leaves, made accumulation of dry matters increased, so that the leaf aera of soybean increased compared with control. The effect of the agent was different in different rotation. The effect decreased in the order of two year continuous cropping, altrernate cropping, three years continuous cropping and normal cropping. The agent iucresed total number of soybean seeds significantly, which made the yield of continuous cropping and alternate cropping soybean increased over 10% compared with control.