How to make up for apple tree "monthly fertilizer"? There are two aspects to pay attention to: one is the area where basal fertilizer is applied in autumn; the other is the method of applying basal fertilizer in autumn.
The best area for applying basal fertilizer in autumn As more than 90% of the absorption roots of fruit trees are distributed at the end of the root system, the area for applying basal fertilizer in autumn should be: young trees are applied outside the projection edge of the fruit tree crown, and the roots are introduced year by year through fertilization. In addition, the root system and canopy are expanded simultaneously. The big tree should be on the inner side of the projection edge of the canopy and where the capillary roots are the most. This is the fertilization area of ​​the high-yield gardens everywhere. Fertilization in the whole garden should be 60 cm away from the trunk. In terms of depth, too shallow fertilization can easily cause the root system to float, which is not conducive to drought and cold resistance of fruit trees. The root system within the range of 5 to 35 cm from the ground surface accounts for 80% of the total root system. The depth of fertilization should be 20 to 40 cm, and special attention should be paid to the supply of nutrients for the shallow root system below 20 cm. The depth of fertilizer application is by no means the deeper the better. Under general fertility conditions, the surface soil has a large temperature and moisture change, which is not conducive to root growth and low fertilizer utilization. The distribution of fruit tree roots in the soil layer below 50 cm is very small, the soil environment is poor, and the fertilizer utilization rate is also very low. Therefore, the autumn base fertilizer should not be too deep.
Method of applying basal fertilizer in autumn 1. Ring furrow application. Dig a ring-shaped trench at the outer projection of the canopy to fertilize, and the amount of damaged roots is less. Pay attention to changing the position outside each year. This method is mainly used in young orchards. 2. Radial furrow application. Dig 5-8 radiating ditches from the inside to the outside, from shallow to deep, 1 meter away from the trunk of the tree, dig out a radial ditch with an outer width of 20-30 cm and an outer depth of 15-30 cm, and then fertilize it. Pay attention to changing positions every year. This method is suitable for sparsely planting big trees. 3. Strip furrow application. Fertilize in a furrow between rows, with a width of 30 cm and a depth of 25 to 30 cm. Fill the furrow and water after fertilization. 4. Spread throughout the garden. This method is suitable for grown-up orchards. It is necessary to spread the fertilizer evenly, combined with deep tillage in autumn, and turn the fertilizer into the ground. However, it should be noted that each plant of the adult tree should not exceed 0.075 kg of urea or potassium chloride, or 0.2 compound fertilizer. Kilograms, especially near the trees should not be too much fertilizer.
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