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我国北方地区年降水量较少,特别是1～2月份气候寒冷干燥,苹果树易因蒸腾失水而抽条,应采取预防措施。 1、追肥与灌水。本着“前促后控”的原则,一般在7月份以前灌水2～3次,7月底以后停止灌水,直至11月初灌冻水,冻水要灌透。在控水期间还要做好排水工作。追肥一般结合前期灌水于5月份追少量氮肥。7～8月份追施磷、钾肥。生长后期结合喷药叶面喷施1～2次磷酸二氢钾。
The annual rainfall in northern China is less, especially in January and February, the climate is cold and dry, and apple trees are prone to runoff due to transpiration and water loss. Precautions should be taken. 1, top dressing and irrigation. In line with the principle of “promoting and controlling before”, irrigation is generally 2 or 3 times before July, and irrigation is stopped after the end of July until the beginning of November. Frozen water should be thoroughly infused. Drainage work well during the water control. Top dressing generally combined with pre-irrigation in May to catch a small amount of nitrogen fertilizer. 7 to August topdressing phosphorus, potash. Combined with the spraying of foliar spray 1 to 2 times during the late growth of potassium dihydrogen phosphate.