不同时期遮光对蚕豆根瘤生长及产量的影响

试验研究了不同时期遮光对蚕豆根瘤生长及根、茎、叶、花荚和籽粒产量的影响。结果表明,在高光照条件下,有利于蚕豆根瘤的形成,根瘤衰亡期推迟,而遮光导致蚕豆根瘤数量减少,根瘤衰亡速度加快;遮光后对根瘤分布的影响,表现在侧根上的根瘤数量比例增大,主根上的根瘤数量比例降低,从而影响根瘤的整体固氮效率。在蚕豆各生育时期,开花结荚和鼓粒期遮光对蚕豆根瘤生长的影响最大,植物器官叶和茎干物质重显著增加;根、花和荚果干物质重显著降低。

Effects of Shading at Different Growth Stages on Nodule and Grain Yield in Faba Bean

This experiments studied the growth of nodule,root stem,leaf,flower pod and grain yield with shading at different growth stages to faba bean.The results indicated that high light was favourable to the growth of faba bean and the delayed of nodule wane.But the number of nodules was decreased and the die of nodule faster.The proportion of sideroot nodule was increased but the taproot's was decreased of shading treatment.Consequently the efficiency nitrogen fixation was low.In different growth stage,effects of the growth nodule at flowering and podding stage were the greatest.The dry weight of leaves and stem were increased significantly,but the dry weight of root and pod were decreased.