小麦根外追肥是一种用肥少、成本低、效果好、简便易行的施肥方法。它既能弥补小麦因后期根系吸收能力衰退而造成的养分不足,又能防御后期干热风的侵害,增加粒重,提早成熟。现介绍几个小麦后期常用的根外追肥方法:1.喷磷酸二氢钾。磷酸二氢钾是一种含磷、钾的复合肥,在抽穗期和扬花期各喷一次0.2—0.3%的磷酸二氢钾溶液,每次每 Wheat root top dressing is a less fertilizer, low cost, good effect, simple and convenient method of fertilization. It can not only make up for lack of nutrients caused by the decline of wheat root absorption capacity at the later stage, but also prevent the hot and dry wind at the later stage, increase grain weight and prematurely mature. Now introduced several late wheat commonly used methods of top dressing: 1. Spray potassium dihydrogen phosphate. Potassium dihydrogen phosphate is a kind of compound fertilizer containing phosphorus and potassium, spraying 0.2-0.3% of potassium dihydrogen phosphate solution at heading and flowering each time, each time