晚播对大豆产量及性状的影响

Effect of late planting on soybean yield and yield components

通过对7月5日至7月25日晚播条件下大豆生长发育研究表明，每晚播5d，株荚数分别降低19．7％、29．6％、51．9％、56．3％。株粒数分别降低14．6％、24．8％、47．6％、60．3％。而对百粒重影响不大。减产率19．0％-72．3％，达极显著水平。7月15日以前播种，可获得70％以上的产量，且能正常成熟，7月20日后播种，仅能获得50％以下的产量，且不能正常成熟。

By investigating the yield and yield components of late planting （july 5 to July 25） soybean, it indicated that every 5 days delaying of planting, the pods of each plant decreased 19.7%, 29.6%, 51.9%, 56.3% correspondingly, seed number of per plant decreased 14.6%, 24.8%, 47.6%, 60.3% respectively. The 100 - seed weight was not affected significantly. Yield decrease rate was among 19.0% - 72.3%. Plandng before July 15 achieved 70% of the average yield, which was mature normally. While planting after july 20, less than 50% yield was achieved, but could not reach maturity.