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生理病害是指西瓜对环境因素不适应导致生理障碍而引起的异常现象。现将常见的生理病害及其防治方法介绍如下:1僵苗症状:植株生长处于停滞状态,生长量小,展叶慢,子叶、真叶变黄,根变褐,新生根少。病因:①土壤温度偏低②土壤含水量高、通气差,发根困难。③定植时苗龄过大,损伤根系较多,或整地、定植时根部架空,影响发根。④施用未充分腐熟的农家肥,造成发热烧根,或施用化肥较多,土壤中的化肥溶液浓度过高而伤根。⑤地下害虫危害根部。
Physiological diseases refers to watermelon does not adapt to environmental factors lead to physiological disorders caused by anomalies. Now common physiological diseases and prevention methods are described as follows: 1 stiff seedling symptoms: plant growth in a stagnant state, the growth of small, slow leaves, cotyledons, leaves true yellow, brown roots, new roots less. Etiology: ① low soil temperature ② high soil moisture, poor ventilation, hair root difficulties. ③ when planting seedling age is too large, more damaged roots, or site preparation, root colonization overhead, affecting hair roots. ④ application of not fully decomposed farmyard manure, resulting in fever or root, or more fertilizer, soil fertilizer solution concentration is too high and root injury. ⑤ underground pests endanger the roots.