1. Burning roots. Most of the farmyard manure comes from animal manure and is rich in organic matter. When these organic fertilizers are not maturized, their nutrient status is slow-acting and cannot be directly absorbed and utilized by the roots of fruit trees. If they are applied, in the process of underground decomposing, due to the strengthening of denitrification, heat is easily generated to cause root burns ( Commonly known as "burning roots") causes root rot.
2. The nutrient release is not synchronized with the tree body. After the application of unfertilized organic fertilizer in autumn, due to the low soil temperature in autumn and winter, and the mixing with the orchard soil layer, it takes a long time for these organic fertilizers to be decomposed in the ground, and the artificial manure is applied 3 years ago without organic application. In the orchard excavation survey, it was found that some of the manure was still in its original state. In the spring of the second year, although the ground temperature has gone up, the spring rain in the main apple producing areas in the north is less, and the rate of application of the organic fertilizer is still very slow. At this time, the tree needs a lot of nutrients to supply the maternal flowering result, and slowly maturing. The limited organic nutrients released by the organic fertilizer simply cannot meet the needs of the tree. At the same time, in the process of decomposing, the microorganisms also consume some of the original nutrients (such as nitrogen fertilizer) in the roots of the fruit trees, and the trees often show malnutrition. After entering the summer and autumn of the second year, with the increase of rainfall, the ground temperature rises rapidly, and the rate of decomposing organic fertilizer is obviously accelerated in the previous year, releasing more organic nutrients that can be absorbed by the tree, leading to tree growth. Accelerate, a large number of strips, poor fruit coloration, excessive vegetative growth, poor flower bud differentiation ability, so that a large amount of organic nutrients are wasted, and the nutrient supply of the tree is out of tune.
3, it is easy to attract pests that are underground wintering. Unfertilized organic fertilizer has a large amount of animal organic matter, so it is an ideal wintering place for many fruit tree pests. It is especially easy to attract all kinds of chafers (蛴螬), peaches, heartworms, scorpions, snails, pears, etc. that are harmful to fruit trees. It is extremely unfavorable for pest control in the coming year.
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