大豆籽实产量与其需水量之间关系的研究

大豆不同生育阶段的土壤水份状况与叶细胞浓度和叶水势关系的研究结果表明,上述水份生理指标与土壤湿度呈极显著的相关。不同灌水形式的试验和田间需水量的测定表明,大豆籽实产量71～260kg/亩的需水量为200～367m~3。在此范围内两者近乎直线正相关,当耗水量超过367m~3/亩时大豆籽实产量无明显增加。大豆在幼苗期、分枝期、花荚期、鼓粒期的适宜土壤湿度分别是田间最大持水率的70％、80％、80％、70％。

STUDY ON THE RELATIONSHIP BETWEEN GRAIN YIELD AND TRANSPIRATION OF SOYBEAN

The relationship of soil moisture condition and cell sap concentration and leaf water potential were studied on soybeans at different growing stages. The results shown that all the plant-water physiological indexes had a close relativity with the soil water content. The irrigation experiment and field water consumption test indicated that soybean grain yield had a fairly linear positive relativity with water consumption within the scope of grain yield 71 -260kg/mu and the scope of plant transpiration 200-367m3/mu. When the plant transpiration was greater than 367m3, The grain yield gave on evident increase. The optimum soil water content for stages seedling plants, branching, flowering and pod-setting, and pod -filling were 70%, 80%, 80% and 70% of the soil water holding capacity respectively.