不同时期倒伏对油菜经济性状及产量的影响

为分析倒伏对油菜经济性状及产量的影响,以中双11号为材料,在油菜生长不同阶段进行人工模拟倒伏处理.结果表明,除成熟后期倒伏外,其他生长期油菜的产量和经济性状指标均受倒伏影响而显著变差;影响程度由大到小依次为:初花期倒伏>盛花期倒伏>终花期倒伏>成熟初期倒伏>成熟后期倒伏,减产幅度分别为67.3%、46.4%、30.7%、23.7%和10.5%.总体表现为倒伏时期越早,倒伏对产量和经济性状造成的影响越大;每果粒数和千粒重在向阳面影响不大,在背阴面减少极为显著,表明倒伏造成田间荫蔽是致使油菜减产的主要原因.

Effects of Lodging at Different Stages on Economic Characters and Yield of Rape

In order to analyze the effect of lodging on economic characters and yield of rapeseed,Zhongshuang 11 was used as material to simulate lodging at different stages of rapeseed growth.The results showed that except lodging at late maturity stage,the yield and economic traits of other growth stages of rapeseed were significantly worsened by lodging,and the order of influence degree from big to small was:lodging at early flowering stage>lodging at full flowering stage>lodging at final flowering stage>lodging at early maturity stage>lodging at late maturity stage,and the yield reduction ranges were 67.3%,46.4%and 3%,respectively.0.7%,23.7%and 10.5%.The earlier the lodging period was,the greater the effect of lodging on yield and economic traits.The number of grains per fruit and 1000-grain weight had little effect on the sunny side,but decreased significantly on the shade side,which indicated that the main reason for the yield reduction of rape was the shade caused by lodging.