所谓根外追肥,就是将易溶于水的肥料配成一定浓度的溶液,用喷雾器对果树叶面喷布,故又叫“叶面喷肥”。根外追肥是果树生产中既简单易行又经济有效的一种施肥方法。其优点是:用肥量少,发挥作用快(如硝态氮和氯化镁喷后15分钟进入叶片内,氯化钾和硫酸镁只需30分 The so-called root top dressing, is to be easily soluble in water dubbed a certain concentration of the solution, with a spray on the foliage of fruit trees, it is also known as “foliar fertilizer.” Root top dressing is a simple and economical way to apply fertilizer in fruit trees. Its advantages are: use less fertilizer, play a role fast (such as nitrate and magnesium chloride spray 15 minutes into the leaves, potassium chloride and magnesium sulfate just 30 minutes