花荚期涝渍胁迫对大豆生长和产量的影响

为探索汛期易涝易渍情况下大豆种植的排水管理措施,通过测坑试验研究了大豆花荚期涝渍对其生理特征和产量的影响。结果表明,涝渍胁迫引起大豆单株实荚数、百粒质量的减少和减产。大豆相对产量和涝渍综合累积水深SFEW_(30)显著负相关(R=0.948 9),随着涝渍时间的延长,减产幅度增大。在供试土壤为砂姜黑土情况下,为保证大豆正常生长发育并高产,花荚期涝渍时必须将农田地下水位在5 d内降至地面以下30 cm。

Impact of Waterlogging at the Flower-pod Stage on Growth and Yield of Soybean

We studied the impact of waterlogging at flower-pod stage on physiological traits and yield of soybean grown in a lysimeter in attempts to improve drainage management of soybean fields. The results showed that the number of pods, weights of 100-pellets and yield of the soybean decreased due to waterlogging, and that the rela-tive yield was negatively related to accumulated depth of waterlogging (R=0.9489). Reduction in soybean yield increased with prolonged duration of waterlogging. To sustain growth and yield of soybean, therefore, the ground-water table should be dropped to below 30 cm of depth in 5 days after waterlogging occurred.