雨季不可忽视果园排水北方果树在水分管理上主要以灌溉保水为主。但到夏季往往雨量较集中，常造成果园积水，使土壤通气性变差，氧气不足，抑制根系呼吸，降低吸收机能，严重缺氧时，引起根系死亡，造成烂根，同时树体地上部表现出叶片萎蔫、叶缘枯焦，整殊死亡等症状，严... Rainy season can not be ignored Orchard drainage north fruit trees in the water management mainly to water and water conservation. However, rainfall tends to be more concentrated in the summer, often resulting in water loss in the orchards, deteriorating soil aeration, lack of oxygen, restraining the respiration of the roots and reducing the absorption function. When severe hypoxia is caused, the root dies and causes rot roots. At the same time, Show wilting leaves, leaf margin Kujiao, the whole death and other symptoms, strict ...