How to apply organic fertilizer to fruit trees?

How to apply organic fertilizer to fruit trees? Please give guidance Fruit trees need balanced supply of nutrients. Although the nutrients in organic fertilizer are very rich, the proportion and content of nitrogen, phosphorus and potassium cannot fully meet the growth needs of fruit trees. Especially in the process of composting organic fertilizer, nitrogen content will further decline, if only organic fertilizer to meet the needs of nitrogen, phosphorus, potassium will be excessive, resulting in waste; if phosphorus and potassium just meet the needs of fruit trees, nitrogen is insufficient. Therefore, organic fertilizer alone can not meet the needs of fruit trees for nitrogen, phosphorus and potassium at the same time, and should be combined with chemical fertilizer. 1. The harm of undecomposed organic fertilizer to fruit trees 1, burn roots Farm manure mostly comes from animal manure. When these organic fertilizers are not decomposed, their nutrient status is slow, and they cannot be directly absorbed and utilized by the roots of fruit trees. If they are applied, they are easy to generate heat in the process of underground decomposition, causing root burns (commonly known as "burning roots") and causing root rot. 2. Nutrient release was not synchronized with fertilizer requirement of tree body. For example, when organic fertilizer is applied in autumn without decomposition, it takes a long time to decompose underground due to low soil temperature. In the spring of the second year, the tree needs a lot of nutrients, and the limited organic nutrients released by the slowly decomposing organic fertilizer cannot meet the needs of the tree. At the same time, in the process of decomposition, microorganisms will also consume part of the original nutrients (such as nitrogen) in the soil of fruit trees, and trees often show malnutrition. After entering summer and autumn, rainfall increases, ground temperature rises rapidly, decomposition speed is obviously accelerated, more organic nutrients that can be absorbed by trees are released, resulting in accelerated tree growth, a large number of branches, poor fruit coloring, excessive nutrient growth, poor flower bud differentiation ability, a large number of organic nutrients wasted, tree nutrition supply imbalance. Some people have dug into the orchard of manure, found that after 3 years there are still some manure in the original state. 3. It is easy to provoke underground overwintering pests. Undecomposed organic fertilizer because it contains a lot of animal organic matter, so it has become an ideal winter site for many fruit tree pests, especially easy to provoke fruit tree damage scarab (grubs), peach fruit borer, geometrid, boat caterpillar, pear net bug, etc., is extremely unfavorable to pest control. 2. Composting and application of organic fertilizer When stacking undecomposed organic fertilizer, the compost site should be selected in a leeward, sunny and high place, agricultural film should be laid on the compost ground or cement ground should be selected, the animal manure in the farm manure should be crushed, the straw should be crushed below 5 cm, and about 3% calcium superphosphate should be mixed with the manure and stacked evenly. Calcium superphosphate is added mainly to prevent nitrogen loss in organic fertilizer and increase microbial activity. After stacking, the surface is flattened with a shovel, about 10 cm thick with mud or covered with agricultural film, and the surrounding pressure is tight to create an anoxic environment to make it decompose as soon as possible. Farm manure piles can be decomposed in about 60 days. When the color of organic fertilizer changes from gray to purple and black, the texture is loose, and there is a foul smell, it indicates that it has decomposed and should be applied to the orchard in time. When fully decomposed organic fertilizer is applied to the orchard, it is necessary to select the part outside the vertical projection of the tree crown, excavate a fertilizer ditch with a width of 30~40 cm and a depth of 30~40 cm, mix the organic fertilizer with a proper amount of chemical fertilizer (nitrogen and phosphorus fertilizer) and topsoil evenly, and then put it into the bottom of the fertilizer ditch, and finally cover it with the bottom raw soil turned out, or spread the whole garden, and turn it into the soil layer after spreading. Click for more organic fertilizer application techniques Click for more chemical fertilizer application techniques