【摘要】 研究了夏大豆外部器官的形成、生长与体内醣氮代谢的关系。开花结莢期间茎内还原醣含量提高,花莢脱落减少;还原醣降低,花莢脱落增多。自盛花到结莢期间,需氮素最多。净光合生产率最高时期,是在叶面积最高阶段前期。更多还原

【Abstract】 The metabolic activity of various organs of the summer-sown soybean plant is highfrom the seedling stage to the differentiation of flower buds.The translocation of various as-similates at the beginning of flowering is more rapid than the earlier stages.The assimilatestranslocate massively from leaves to the storage and reproductive organs.Until floweringstage,the synthetic process rises gradually.Thence,the growth of pods goes on sub-sequently.During the period of flowering and pod-growing the concentration of soluble sugars in-fluences significantly on the shedding rate of flowers and pods.The higher the concentrationof soluble sugars,the less the flowers and pods shed,and vise versa.The requirement of nitrogen is high during the period between flowering and pod forma-tion.The use of available nitrogeneous fertilizer in the early flowering stage would be favour-able to meet the nitrogen requirement of the plant,and results in higher yield.The highest rate of net assimilation of the plant occurs before maximum leaf area hasreached.更多还原