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近几年来,在伏早期间对棉花“要不要抗旱”以及“早抗与晚抗”、“大抗与小抗”等问题常有争论。有些社队掌握较好,适时抗旱,获得了高产;但也有些社队由于未进行抗旱或抗旱偏迟或偏早、灌水偏多或偏少,影响了棉花正常生长发育,不能获得棉花高产。有的甚至造成严重减产。在7月中旬前后,棉花开始进入花铃期,正是上海地区常年伏旱季节。这时棉花枝叶繁茂,叶片光合作用加强,蒸腾作用强烈,大量水分从叶片蒸腾出去。为了保持棉株体内水分的平衡,保证植株正常进行各项生理活动,就必须不断地从土壤中吸收水分。花
In recent years, there has been frequent controversy over the issue of “whether or not to resist drought” and “early resistance and late resistance” and “big resistance and small resistance” during the early period of volt. Some communes and brigades and teams have a good grasp of timely drought fighting and have obtained high yields. However, some communes and brigades have been unable to obtain high-yielding cotton because normal or poor irrigation is delayed or too early due to no drought or drought. Some even caused serious cuts. Around mid-July, cotton began to enter the flower-boling period, which is the perennial drought season in Shanghai. At this time cotton lush foliage, photosynthesis leaves stronger, strong transpiration, a lot of water from the leaves of transpiration. In order to maintain the balance of moisture in cotton plants, to ensure the normal physiological activities of plants, we must continue to absorb moisture from the soil. flower