灾害性天气对棉花的危害及补救措施
xiandai nongcun keji（2017）
Abstract
棉花从播种到收获,均可能遭受灾害性天气危害.经常发生的天气灾害包括干旱、高温、大风、阴雨、冰雹、冻害等.
1 干旱
1.1 危害.棉花蕾期至初花期受旱后,棉株叶色灰绿,叶片中午萎蔫,傍晚不能恢复;心叶卷曲成"疙瘩",2~3个大蕾围在顶心周围,顶心不随太阳转;开花比正常棉株早而快.花铃期受旱,棉株中、上部干黄的蕾、铃明显增多,但干而不落.吐絮期受旱,棉田一片黑褐色,干铃、僵铃多,吐絮铃少.
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