Effect of Drought-Stress on Soybean Root Distribution and Agronomic Traits at Different Growth Stages
In order to explore drought impact on soybean root distribution and agronomic traits in different growth stages,we took soybean varieties Jiyu 88 as test materials,the effect of drought stress at different growth stages on spatial distribution of soybean root dry weight was studied by soil-drilling method in the removable rainproof shelter.The results showed that compared with control,root distribution in 21-110 cm soil layer was increased significantly by mild and severe drought at seedling stage.Drought stress at branching and flowering stages had the most serious influence on root system,especially under severe drought at flowering stage,total root weight was reduced by 22.55％,root distribution in 21-110 cm soil layer was reduced by more than 60％.Mild drought at seedling stage did not had significant effect on plant height,nods,pods weight per plant,seed weight,and 100-seed weight.Most agronomic traits were significantly affected by mild drought at branching and flowering stages,while only 100-seed weight decreased significantly by mild drought at filling stage.Pods weight,seed weight and 100-seed weight dropped significantly by severe drought from seedling stage to filling stage.Severe drought at branching and flowering stages had the strongest impact on agronomic traits,such as plant height,pods weight per plant,seed weight decreased by more than 40％,and nods decreased by more than 20％.
国家科技期刊平台
NSTL
万方数据
维普
