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喷施叶面肥,是蔬菜追肥中的一项补救措施。据试验,增产效果十分显著,其增产幅度为14.2—28.5％。因为叶面肥通常只用数量极少的一种或两种肥料,而且是针对土壤的营养状况和蔬菜某一生育阶段对某种元素的急需施用的。因此,将三大类蔬菜如何喷施叶面肥简介于后: 一、叶菜类:如白菜、甘蓝、菠菜、芹菜、豌豆尖等,它们在备生育阶段需氮较多,叶面肥应以尿素、碳铵为主,一般喷施浓度尿素为2％,碳铵为1.5％。每次每亩喷水50—60公斤,每季可喷施2—4次。
Spraying foliar fertilizer is a remedy in the vegetable top dressing. According to the test, the yield increase effect is very significant, and its yield increase rate is 14.2-28.5%. Because foliar fertilizer is usually only a very small number of one or two kinds of fertilizers, but also for the nutritional status of soil and vegetables at a given stage of development of the urgency of the application of an element. Therefore, the three major types of vegetables how to spray foliar profile in the later: First, leafy vegetables: cabbage, cabbage, spinach, celery, pea sharp, etc., they need more nitrogen in the preparation stage, foliar fertilizer should With urea, ammonium bicarbonate-based, the general concentration of urea spraying 2%, ammonium bicarbonate 1.5%. Spray water 50-60 kg per acre, spray 2-4 times per season.