A misunderstanding of fertilizer management is that the more fertilization the better. Excessive use of fertilizers can easily lead to soil degradation and consolidation; high yields in recent years can easily lead to a decline in tree potential, and the disease will be concentrated in a short period of time, causing tree weakness and even death. Fertilization should be “seeing trees and fertilizingâ€, and different years, different stands, and different plants should be treated differently. The dominant factor in producing large and small years is nutrient deficiencies. Therefore, the forests with obvious years and years should be fertilized in the fruit expansion period ( June-July ) to slow down the nutritional needs of the fruit development and the development of the next year. Promote the development of short fruit branches in the next year; apply large fertilizers during the sap flow period in small years to promote the development of healthy fruit branches in spring. In the production of strong forests, the fertilizer should be applied close to the nutrient ratio of the forest output, nitrogen: phosphorus: potassium = 2 : 1 : 2 . Excessive nitrogen often leads to vegetative growth, and there is less fruiting . Phosphorus and potassium fertilizer should be applied, and the roots should be cut at 2/3 of the canopy projection. After the results are stabilized, the proportion of nitrogen and phosphorus should be applied . The best test at present is Russian imported compound fertilizer. High yield and stable yield of pecans must be grasped by two critical periods of fertilization, fertilization and fertilization methods. 1st fertilization critical period: mid-May to early young fruit enlargement facilities available fertilizer-based. The fruit volume increased rapidly from the fruit to the middle of July , and the large number of nutrients were consumed in the next year. The existence of obvious vegetative growth and competition between reproductive growth, reproductive growth and reproductive growth, the nutritional deficit led to June . A large number of fruit fell from mid- July to early July . This fertilization can reduce the amount of fruit falling and increase the yield. The second critical period of fertilization: long-acting fertilizer after fruit application in late August , mainly organic fertilizer. Before the fruit is harvested to the deciduous leaves, it is the result of the fullness of the branches, and the accumulation of nutrients is large, which is crucial for the differentiation of the female flowers in the next year, which will directly affect the yield of the next year. Fertilization amount: Calculated by applying 1kg compound fertilizer per 10kg of fruit , and specific fertilization due to tree. The tree is rich in nutrients, showing that the male flower buds developed from June to July are full, and can be fertilized or not fertilized; the tree body is deficient in nutrition, and the male flower buds are thin and small, which must be combined with water management, and a small amount of fertilizer is applied several times. Fertilization method: Applying an annular groove, covering the soil after the deep application of the annular ditch on the inside of the canopy drip line.
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