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肥害,是指因施肥过多,或因施肥过分集中时,对果树造成的可见性伤害讲的。但不包括因施肥不当而引起的生理性障害。以苹果为例,当施用过高浓度的氨水时,会烧灼树根使成褐色,并且随着肥料在体内的运输,中毒现象迅速向主根基部、主干及枝梢上蔓延,沿着木质部出现带状紫线,使树皮干枯、凹陷,并与好皮分离。严重时,还会造成大枝或整株死亡。这种情况,在梨树和大樱桃树上也有发生。1958～1959年间,黄县龙口园艺场对大樱桃施用硫酸铵,硝酸氨钙等氮素化肥,由于施肥过于集中,致使根系烧灼,死树100余株。为了防止果树肥害,施肥时,施肥量不要过多,施肥不能过分集中。施用硫酸铵和
Fertilizer, refers to due to excessive fertilization, or due to excessive concentration of fertilizers, the damage caused by the visibility of the tree about. But does not include due to improper fertilization caused by physical disorders. In the case of apples, when applying a high concentration of ammonia, it burns the roots to brown, and with the transport of the fertilizer in the body, the poisoning rapidly spreads to the roots, stems and branches of the main roots, along the xylem Belted purple line, the bark dry, hollow, and with a good skin separation. In severe cases, it may also result in the death of large branches or whole plants. This happens in pear trees and cherry trees. Between 1958 and 1959, Huangkou Longkou horticultural field applied ammonium nitrogen fertilizer such as ammonium sulfate and calcium nitrate nitrate to the big cherry. Due to the concentration of fertilizer, the roots were burned and more than 100 dead trees died. In order to prevent fruit trees fat, fertilization, the amount of fertilizer should not be too much, fertilization can not be too concentrated. Ammonium sulfate and