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1.化学控制是防止棉花蕾铃脱落的有效办法之一。在开花结羚期间,应用20ppm 赤霉素的水溶液涂抹在开花后1天的棉花幼铃上,可以显著地提高结铃率。使盛花期棉铃的脱落率减少23.1—62.7,结铃期棉铃脱落率减少21.9—41%。2.赤霉索对棉铃生长有促进作用。赤霉素处理的棉铃生长加快,处理后15天内比较明显,15天后处理棉铃生长速度逐渐下降,与对照的差异逐渐缩少。3.应用20ppm 赤霉素的水溶液处理不受精棉铃,可以诱导无籽棉铃的形成。
1. Chemical control is one of the effective ways to prevent cotton buds from falling off. During the flowering of antelope, application of 20ppm gibberellin solution on cotton bollworm 1 day after flowering, can significantly improve the boll rate. So that the flowering cotton boll shedding rate decreased 23.1-62.7, boll boll shedding rate decreased 21.9-41%. Gibberellin cable to promote the growth of cotton bolls. Gibberellin-treated cotton boll grew faster and became obvious within 15 days after treatment. The growth rate of cotton boll wee dropped gradually after 15 days, and the difference with the control gradually decreased. 3. The application of 20ppm gibberellin solution of unrefined bolls, seedless bolls can be induced to form.