不同土壤水分条件对大豆产量的影响

通过盆栽条件下对土壤水分设置 5个水平 ,分别对大豆营养生长期、花期、荚期和鼓粒期 4个关键生育期进行水分控制 ,研究对大豆子粒产量的影响。试验结果为 :营养生长期干旱可减产19.4 2 % - 2 1.11% ,涝灾可减产 6 .97% ;花期干旱可减产 17.70 % - 2 5 .92 % ,涝灾可减产 14 .91% ;荚期干旱可减产 2 3.77% - 33.89% ,涝灾可减产 13.70 % ;鼓粒期干旱可减产 12 .2 5 % - 40 .6 1% ,涝灾可减产 10 .10 %。同一水分条件对不同生育期进行处理结果是 :各个生育期进行“特涝”处理 ,其子粒减产程度没有差异 ;在干旱条件 ,不同生育期处理产量损失大小结果为 :荚期 >花期 >营养生长期 >鼓粒期。

EFFECTS OF VARIOUS SOIL MOISTURE ON THE YIELD OF SOYBEAN

In this pot experiment, the soil moisture were controlled by 5 levels, and the effects of the moisture, which were controlled in vegetative stage, flowering stage, podding stage and podfilling stage, on soybean yields were studied respectively. The results showsed that a long term drought in vegetative stage made soybean yields derease to 19.62%-21.11% and the water logging to 6.97%; the drought in flowering stage to 19.18%-27.26% and the water logging to 14.9%; the drought in the podding stage to 23.80% -33.84% and the water logging to 13.67%; the drought in the podfilling stage to 12.20%- 40.59% and the water logging to 10.03%. The results also showed that there were no differance of soybean yields in the most water logging treatment in every srowing stage. In drought condition, the loss of soybean yields in different srowing period took turns less to be in podding, flower, vegetative and podfillings stage.