赤霉素对黄瓜生理性病害“花打顶”的解救效果

Control effect of gibberellin on cucumber blossom-end rot(BER)

喷施赤霉索溶液可以打破黄瓜生理性病害“花打顶”对黄瓜生长的抑制作用，促进恢复黄瓜的生长发育。喷施赤霉素后1周内，黄瓜的伸蔓速度开始加快，施药后第2周黄瓜的伸蔓速度达到最大。在62．5～938．5mg／kg的浓度范围内，黄瓜株高的日平均增长量随着赤霉索使用浓度的增高而增加。赤霉索的药效可以维持14d以上。一般情况下，用纯度为75％的赤霉素结晶粉0．5～15g／666．7m^2，喷施1次有效成分浓度为187．5-562．5mg／kg赤霉素溶液，同时配合其他管理措施，可以有效解除“花打顶”对黄瓜的危害。

Spraying gibberellin solution upon cucumber could control cucumber BER and resume cucumber growth. The experiments showed that within one week after spraying, the elongation of cucumber vine sped up, and within the 2nd week after spraying the elongation speed reached maximum. When gibberellin concentration was between 62.5-938.5 mg/kg, the mean daily growth of cucumber plant height increased with the used concentration and the control effect of gibberellin could last 14 d or more. Using 0.5-1.5 g/666.7 m^2 75 % crystalline gibberellin powder and spraying 187.5 - 562.5 mg/kg gibberellin solution one time and meanwhile taking other control measures could effectively control cucumber BER.