Apple Shijifei eight attention
1. Master the appropriate fertilization time  Apple Shiji Fertilizer is best for autumn. Generally, early-maturing varieties are applied after fruit picking, and mid-late maturing varieties are applied before and after fruit picking, preferably sooner rather than later. For example , in early September , the temperature is high, the rainfall is high, there is sufficient time for the fertilizer to decompose, the function of the leaves has not yet declined, and there is a strong photosynthetic function, and the nutrients produced can be returned to the roots. At this time, it is the second highest peak of the root growth of the fruit tree, and the root is easy to heal, and a large number of meristematic roots and absorbing roots are produced, which is beneficial to root absorption and increase the nutrient level of the tree.
　　 3. Adopt the correct fertilization method  Whether it is an annular ditch, a radiation ditch or a strip ditch, or a whole garden, the fertilizer cannot be agglomerated. The decomposed organic fertilizer, chemical fertilizer, etc. should be thoroughly mixed with the rhizosphere soil, the fertilizer should be dispersed and breathable, and the nutrients should be slowly released to improve the utilization of nutrients. If the local concentration of the soil is too high, it is easy to cause Xiaogan phenomenon.
　　 4. Pay attention to protecting the root system  Care should be taken to protect the root system, especially the fine roots that are 0.3 to 0.5 cm thick on the lateral roots of each stage. This kind of roots has a large number of fibrous roots with good absorption function. The large roots exposed by the ditch should be buried in the loose soil after being turned over, and buried with the ploughing to prevent long-term wind and sun exposure, and drain the roots. . At the same time, the root should be cut with a sharp cut to facilitate early healing of the early roots.
　　 5. Apply more organic fertilizer  Organic fertilizers include manure, compost; manure, chicken manure, human waste, grass manure, green manure, crop straw weeds and leaves, etc. Wood contains only a variety of elements needed for fruit trees to meet the growth needs of trees, and long-term The continuous use of organic fertilizer can effectively improve the soil and make the fertility factors such as soil water, fertilizer, gas and heat more coordinated. The organic matter content of high-quality and high-yield orchards should reach 2% to 3% . When applying the base fertilizer , it is generally suitable to produce about 1 kilogram of organic fertilizer for 500 grams of fruit .
　　 6. Organic fertilizer needs to be treated  Organic fertilizer needs to be decomposed by decomposing before it can be absorbed and utilized by fruit trees. The correct method is to mix manure, grass, straw, etc., add appropriate amount of water to seal with mud, and carry out high temperature stacking treatment. When the fertilizer is fully decomposed, the nutrient is converted and then applied. The decomposing of organic fertilizer in Futian takes 25 to 45 days.
　　 7. Formulation of inorganic fertilizer  Fruit trees have a certain proportional relationship with various demand, and the soil contains a certain proportion of nutrients. Therefore, according to the needs of fruit trees, according to the management level of orchard, soil conditions, and fertilizer requirements, the corresponding fertilization formula should be adapted. . At the same time, due to large amount of phosphorus required young fruit, usually twice a nitrogen, potassium, so that N: P: K can be 1: 2: 1, and later into the flourishing, need a large amount of N and K ratio formula Should be adjusted to 2 : 1 : 2 . Generally, the amount of base fertilizer is about 20% of the estimated fertilization amount in the following year .
　　 8. Appropriate application of micro-fertilizer   Trace elements play an important role in the growth and development of trees and high quality and high yield. When the demand is insufficient, it is prone to deficiency syndrome, such as yellowing disease in iron deficiency and lobular disease in zinc deficiency. Commonly used micro-fertilizers are ferrous sulfate, zinc sulfate, manganese sulfate, borax and the like. However, it should be noted that the direct application of ferrous sulfate into the soil will quickly convert into insoluble compounds, so it is better mixed with organic fertilizers such as nitrogen and phosphorus; borax is best mixed with organic fertilizers such as nitrogen and phosphorus; It should be added on the basis of adding organic fertilizer; manganese sulfate is easy to be fixed and cannot be directly applied to soil.
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