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果树生产上发生的某些营养失调问题,有时很难用土壤施肥或叶面喷肥等方法加以解决。例如,石灰性土壤上苹果、梨树的缺铁失绿问题,是一个典型例子。土壤中铁化合物的含量虽然很高,但溶解度极低,无法为果树所利用,而土壤施入有效性铁肥,又
Some problems of malnutrition in the production of fruit trees are sometimes difficult to be solved by soil fertilization or foliar spray. For example, lime-deficient apples and pear trees on lime-green soil are a typical example. Although the content of iron compounds in the soil is very high, the solubility is extremely low and can not be used by fruit trees. However,