Fertilization is the main way to artificially supplement soil nutrients, fertilize soil fertility, improve fertility, and meet the nutrients needed for crop growth and development. 80% of the orchard's fertilizer requirement is placed in the fall (September-October), and the effect of increasing yield is very obvious.
Main reason
1. The root system grows vigorously and has strong absorption capacity. Autumn is the last growth peak of the root system in a year. At this time, the root system of fertilization is easy to heal. The roots are good for promoting new roots. Its life activity is strong, its ability to absorb nutrients is strong, and it is beneficial to delay leaf senescence and enhance the photosynthesis ability of autumn leaves. Increase tree nutrient storage. If the autumn fertilizer is changed to spring application, the injured root system cannot heal in time, and the nutrient transport to the ground is blocked, which has a great influence on the growth of the tree.
2. The soil temperature and humidity are suitable, which is conducive to nutrient decomposition. From September to October, the soil temperature is higher and the sensation is better, which is conducive to soil microbial activities. The organic fertilizer applied is fast and easy to be absorbed and utilized by roots. Fertilization in autumn can increase the effects of nitrogen, phosphorus, potassium, calcium and magnesium by 1 time, 5 times, 3 times, 2 times and 2 times respectively. However, there is less precipitation in spring, poor soil moisture, slower decomposition of applied fertilizer, low utilization rate, and easy to cause rooting.
3. Coordinating nutrient supply, the tree is stable and robust. The application of autumn fertilizer is conducive to the coordination of vegetative growth and reproductive growth. After the quick-acting nutrients in the fertilizer are absorbed, it can greatly enhance the function of autumn leaves, increase the accumulation of nutrients, and make the flower buds full and full. In the coming spring, the germination is early, the flowers are neat, and the spring shoots grow strong. The growth is large, which is conducive to maintaining a strong and high-yield robust tree; while the delayed-effect nutrients are decomposed and decomposed in the soil for a long time, and the spring is easily absorbed and utilized, which strengthens the late spring shoot development and improves the quality of the medium and short branches. Timely stoppage has created conditions for flower bud differentiation. If the base fertilizer is applied in spring, the nutrient decomposition and transformation will be slow due to drought, and the tree body growth will be “misplaced†during the peak period of the fertilizer, resulting in prosperous greens, prolonged leaves, and the inability of nutrients to reflow in time, affecting the annual output. 
4. Improve the root growth environment and improve the tree's resistance to stress. Combined with autumn fertilization and deep soil turning, it can optimize soil structure, improve soil permeability, facilitate root respiration, and improve soil water storage and fertilizer retention. In addition, deep renovation of soil can also destroy some wintering places of pests and diseases, reducing pests and diseases. 
5, fertilization in autumn, a wide range of fertilizer sources, and does not conflict with other crops requiring fertilizer. (Chinese Fertilizer Information)
Main reason
1. The root system grows vigorously and has strong absorption capacity. Autumn is the last growth peak of the root system in a year. At this time, the root system of fertilization is easy to heal. The roots are good for promoting new roots. Its life activity is strong, its ability to absorb nutrients is strong, and it is beneficial to delay leaf senescence and enhance the photosynthesis ability of autumn leaves. Increase tree nutrient storage. If the autumn fertilizer is changed to spring application, the injured root system cannot heal in time, and the nutrient transport to the ground is blocked, which has a great influence on the growth of the tree.
2. The soil temperature and humidity are suitable, which is conducive to nutrient decomposition. From September to October, the soil temperature is higher and the sensation is better, which is conducive to soil microbial activities. The organic fertilizer applied is fast and easy to be absorbed and utilized by roots. Fertilization in autumn can increase the effects of nitrogen, phosphorus, potassium, calcium and magnesium by 1 time, 5 times, 3 times, 2 times and 2 times respectively. However, there is less precipitation in spring, poor soil moisture, slower decomposition of applied fertilizer, low utilization rate, and easy to cause rooting.
3. Coordinating nutrient supply, the tree is stable and robust. The application of autumn fertilizer is conducive to the coordination of vegetative growth and reproductive growth. After the quick-acting nutrients in the fertilizer are absorbed, it can greatly enhance the function of autumn leaves, increase the accumulation of nutrients, and make the flower buds full and full. In the coming spring, the germination is early, the flowers are neat, and the spring shoots grow strong. The growth is large, which is conducive to maintaining a strong and high-yield robust tree; while the delayed-effect nutrients are decomposed and decomposed in the soil for a long time, and the spring is easily absorbed and utilized, which strengthens the late spring shoot development and improves the quality of the medium and short branches. Timely stoppage has created conditions for flower bud differentiation. If the base fertilizer is applied in spring, the nutrient decomposition and transformation will be slow due to drought, and the tree body growth will be “misplaced†during the peak period of the fertilizer, resulting in prosperous greens, prolonged leaves, and the inability of nutrients to reflow in time, affecting the annual output. 
4. Improve the root growth environment and improve the tree's resistance to stress. Combined with autumn fertilization and deep soil turning, it can optimize soil structure, improve soil permeability, facilitate root respiration, and improve soil water storage and fertilizer retention. In addition, deep renovation of soil can also destroy some wintering places of pests and diseases, reducing pests and diseases. 
5, fertilization in autumn, a wide range of fertilizer sources, and does not conflict with other crops requiring fertilizer. (Chinese Fertilizer Information)
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