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我国北方一些地区,因土壤pH高,导致其中有效性微量元素含量很低而不能满足果树植物的正常生长发育,进而导致严重的缺素症。通过土壤直接施肥或通过灌溉水将化肥施入土壤,肥料中的微量元素很快会被土壤固定,因而这些方法不能有效地解决缺素症问题。作者用5年时间研制成功了应用于果树植物的系列复合叶面肥,这些叶面肥不仅含有植物所需的大量元素,而且含有微量元素、有机营养及植物生长调节剂;叶面肥的配方也因果树植物种类、生长习性的不同而异。以油桃和葡萄为试材,喷施复合叶面肥72h后,叶片中叶绿体含量、硝酸还原酶活性、铁和锌含量显著提高;叶面肥还能增进油桃和葡萄果实品质,促进葡萄枝芽增重,但不会引起葡萄树体徒长。整个生长季节喷施复合叶面肥对树体均有益,但喷施间隔时间不应少于7～10d。
In some parts of northern China, due to the high pH of soil, the effective trace elements in them can not meet the normal growth and development of fruit trees, resulting in serious deficiency syndrome. Fertilizers can be quickly fixed in the soil by fertilizing the soil directly or by applying irrigation water to the soil. Therefore, these methods can not effectively solve the problem of deficiency. The author has successfully developed a series of compound foliar fertilizers applied to fruit trees and plants for five years. These foliar fertilizers contain not only large quantities of elements required by plants but also trace elements, organic nutrition and plant growth regulators; Also varies according to plant species, growth habit. With nectarines and grapes as test materials, the content of chloroplast, nitrate reductase and iron and zinc in leaves were significantly increased after spraying compound foliar fertilizer for 72h. Foliar fertilizer could also improve the quality of nectarine and grape fruits and promote the growth of grape Branches weight gain, but does not cause grape vine body lengthened. Spraying compound foliar fertilizer throughout the growing season is beneficial to the tree, but spraying interval should not be less than 7 ~ 10d.