Autumn is the best season for topdressing fruit trees. However, some fruit growers use untransformed organic fertilizer when applying base fertilizers, causing many hidden dangers.
1. Burns the root system. Farmyard manure mostly comes from animal excrement. When these organic fertilizers are not cooked, their nutrient state is slow, and they cannot be directly absorbed and utilized by the roots of fruit trees. If they are applied, they will easily generate heat during the process of subsurface decomposing and cause root burns (commonly known as “burning rootsâ€). Causes root rot.
2. The nutrient release is not in sync with the need for tree fat. In the autumn, unfermented organic fertilizers are applied. Due to the low soil temperature, it takes a long time to rot in the ground. In the spring of the second year, the tree needs a lot of nutrients, and the nutrients released by the slowly decomposing organic fertilizer can not meet the needs of the tree. At the same time, the microorganisms will also consume part of the nutrients (such as nitrogen fertilizer) in the root soil of the fruit trees during the decomposing process. This way the trees often show malnutrition in the spring. After entering the summer and autumn, the rainfall increased, the ground temperature rose rapidly, the speed of composting of organic fertilizer increased significantly, and the release of organic nutrients increased. This will lead to accelerated growth of the tree, a large number of strips, poor coloration of the fruit, excess nutrient growth, poor flower bud differentiation. Some people once surveyed the excavation of orchards applied to raw manure and found that some of the raw manure remains in its original state after 3 years.
3. Insect pests that have passed the winter. Since organic fertilizer without decomposition contains a large amount of animal organic matter, it is an ideal wintering place for many fruit tree pests, and it is particularly easy to attract scarabs (cockroaches), peach fruitworms, ulnar catfish, boat-shaped caterpillars, and pear flower worms that harm fruit trees. Pest control is extremely unfavorable.
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