When excessive fertilizer is applied, the fibrous roots and fine roots of the fruit tree will turn reddish-brown and gradually rot, and the main root cortex will turn brown and necrotic. The necrotic cortex mostly extends up to the trunk, main branch, lateral branch and tip along the rhizome, which can seriously cause the entire tree to die.
The law of occurrence will over-quantify the fertilizer buried near the root of the tree or the fertilization ditch too close to the rhizome or the concentration of the liquid fertilizer is too high, all of which are likely to cause poisoning and necrosis of roots and branches. In addition, the improper application of acidic or alkaline fertilizers, but also easily lead to root rot of fruit trees.
Preventive measures 1 Rational application of chemical fertilizers. According to the pH of the soil, use physiological alkaline fertilizer or physiological acid fertilizer. 2 Use the correct fertilization method. The fertilization ditch should not be too close to the rhizomes; when applying liquid fertilizers (human waste, pig manure, etc.), it should be diluted with water and then poured into the fertilization ditch, and then cover the soil; when the granular fertilizer or powder chemical fertilizer is applied, the hard block should be crushed Afterwards, they must be mixed with soil and spread evenly.
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