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1 老化苗 育苗期间土壤干旱或受低温影响时间过长，导致根系发育不良，瓜苗会出现生长缓慢，真叶变小，育苗时间延长而成“老化苗”。防治措施：土壤湿度保持田间最大持水量的 85％左右；苗破心后温度白天保持 25～ 28℃，夜间 15℃左右。 2 高脚苗 出苗前床土温度保持 30℃?
1 Aging seedlings during soil drought or cold affected by low temperature for too long, resulting in poor root development, melon seedlings will appear slow growth, true leaves become smaller, seedling time and become “aging seedlings.” Control measures: soil moisture to maintain the field maximum water holding capacity of about 85%; seedlings broken heart temperature during the day to maintain 25 ~ 28 ℃, 15 ℃ night. 2 tall seedling bed before bed temperature to maintain 30 ℃?