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把肥料配制成低浓度的水溶液,喷到叶、新梢和幼果上,使树体吸收利用,这种追肥方法叫根外追肥,也叫叶面喷肥。它具有简单易行,用肥量小,发挥作用快,可及时满足果树急需的优点。果树根外追肥可喷氮、磷、钾。1.喷氮:生产上常用的氮肥有尿素和腐熟的人尿。尿素是中性肥料,有效成分高,分子体积小,扩散性强,易进入细胞,适于多种果树;同时具有稳定的特点,可与波尔多液、
The fertilizer formulated as a low concentration of aqueous solution, sprayed onto the leaves, shoots and young fruit, the tree body to absorb the use of this top dressing method called root top dressing, also known as foliar fertilizer. It is easy to use, with a small amount of fertilizer, play a role fast, fruit trees can be timely to meet the needs of the merits. Topdressing fruit trees can spray nitrogen, phosphorus, potassium. 1. Nitrogen spray: nitrogen fertilizer commonly used in production of urea and decomposed human urine. Urea is a neutral fertilizer, high active ingredients, small molecular size, strong diffusivity, easy access to cells, suitable for a variety of fruit trees; also has the characteristics of stability, with Bordeaux mixture,