论文部分内容阅读
进行以氮为主的叶面喷肥,由于用量少,效果好,操作简便,故广泛用于苹果、梨、葡萄等果树生产上。但喷施不当,也会出现不少事故,或叶片受灼,或大量落叶,严重影响果树的长势。因而,在叶面喷肥时,必须注意: 一、喷施的浓度不能过高。常用喷肥的安全浓度,各有不同。使用时,都不能超过最高限界。氮肥有0.1～0.44％尿素液,0.3～
Nitrogen-based foliar fertilizer, due to less dosage, good effect, easy to operate, it is widely used in apple, pear, grape and other fruit trees. However, improper spraying, there will be a lot of accidents, or leaf burning, or a large number of leaves, seriously affecting the growth of fruit trees. Therefore, foliar fertilizer, we must pay attention to: First, the spray concentration can not be too high. Commonly used safety of fertilizer concentration, each different. When used, can not exceed the ceiling. Nitrogen fertilizer 0.1 ~ 0.44% urea solution, 0.3 ~