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答山西读者魏岩苹果树的肥害,一般是指因施肥不当,而使树体某些部分发生灼伤或损害,影响正常生长的现象。引起肥害发生通常有两个原因:一是施肥方法不当。土壤施入土粪或化肥时,施肥区域过于集中,或肥料直接接触根系,造成树根灼伤。叶面喷肥,肥液浓度过高,或喷布时间不当(如炎热天中午喷布),致使叶片焦灼干枯。二是施肥量过多。大量地集中施入碳酸氢铵、氨水等氮素化肥,使根系受灼变成褐色。随着肥料在树体内运转,主根基部、主干及枝梢也可能会发生中毫,树皮干枯凹陷,严重时造成大枝或整株树死亡。
A Shanxi reader Wei Yan Apple tree fat, generally refers to improper fertilization, leaving some parts of the tree burns or damage, affecting the normal growth of the phenomenon. There are two common causes of fertilizer damage: First, improper fertilization methods. When soil is applied to soil manure or fertilizer, the fertilization area is too concentrated or the fertilizer directly touches the root system causing root burns. Foliar fertilizer, fluid concentration is too high, or spray improper time (such as hot noon spray), resulting in anxious leaves dry. Second, too much fertilizer. A large number of concentrated into the application of ammonium bicarbonate, ammonia and other nitrogen fertilizers, the root burned into brown. With the fertilizer running in the tree body, the base of the main root, trunk and shoots may also occur in the mill, dry bark depression, in severe cases caused by the death of large branches or whole trees.