The best time for applying the base fertilizer to the fruit trees is autumn, but for various reasons, the orchards that do not apply the base fertilizer in time can be used to supplement the base fertilizer in the early winter season.
When fertilizing fruit trees in winter, on the ground under the fruit trees, with the trunk as the axis, keep about 80 cm away from the middle, and start digging 4~6 radial grooves outward. The outer ditch is deeper and wider than the inside; Dig the strip groove under the outer edge of the canopy, try to make the groove depth 20~40 cm, the length is about 80 cm, the width is about 40 cm, avoiding the thick root of the tree. After the fruit tree is applied with fertilizer, the fertilizer cannot be covered with soil immediately, and the fertilizer and soil are thoroughly stirred with the agricultural implement, and then covered and poured with appropriate amount of water.
Special considerations for fertilization of fruit trees
1. Try not to use ammonium bicarbonate as a fertilizer when the soil of the plant is dry. Since ammonium bicarbonate is chemically unstable, it is easily volatilized. Therefore, when using ammonium bicarbonate as a fertilizer, it is necessary to ensure that the soil is wet, and immediately after application, the soil is covered to reduce volatilization.
2. Sulfur ammonium cannot be used as a fertilizer. In orchards where the soil is acidic or slightly alkaline, many soils cause soil stratification due to improper reuse of ammonium sulphate. In this case, the fruit tree will grow slowly.
3. Do not water the fruit tree immediately after using urea as a fertilizer. Because of the chemical nature, urea in water will be lost a lot, and the fruit trees are easy to absorb the ammonium carbonate converted from nitrogen, so the nutrient absorption rate of the fertilizer is reduced, so after the fertilization, the fruit trees are watered in a few days.
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