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夏季是黄瓜、番茄、辣椒、茄子等果菜类蔬菜旺盛生长季节,同时,也是这类菜易发生早衰的时期。其早衰的症状是:植株及心叶萎缩,叶片发黄,果实小而成熟晚,产量低而品质较差;严重的可导致植株过早死亡。其原因多是高温多雨或高温干旱;高温时气温超过35℃,菜株或因发生生理干旱、或大气干旱,株体水分运输与叶片气孔蒸腾失水出现不平衡;或在多雨、土壤过分潮湿季节,土壤因积水缺氧,导致植株根系呼吸困难,出现酒精中毒而早衰死亡。因而,加强防御很有必要,其防御方法是:
Summer is cucumber, tomato, peppers, eggplant and other fruit and vegetable vegetables growing season, at the same time, is also prone to premature aging of these vegetables period. Symptoms of premature aging are: atrophy of plant and heart, yellowing of leaves, small and mature fruits, low yield and poor quality; severe premature death of plants. The reason is mostly high temperature and rainy or high temperature and drought; when the temperature is higher than 35 ℃, vegetable plants or due to physiological drought, or atmospheric drought, plant water transport and leaf stomata transpiration dehydration imbalance; or in the rainy, Season, the soil due to lack of water, resulting in plant roots breathing difficulties, premature death due to alcoholism. Therefore, it is necessary to strengthen the defense. The defense method is: