First, pay attention to the concentration of inorganic fertilizer and fertilizer. The roots of potted fruit trees are concentrated in the pots. If the fertilization concentration is too large, or if the amount of fertilization is too much, reverse osmosis may occur in the root system, and root rot may even be caused. The fruit tree plants die. Fertilization should master the principle of “deep diligence, small amount of fertilizationâ€. The application of urea and compound fertilizers should be controlled at a concentration of 0.2-0.5%, and the amount of each pot should be controlled at 1-2 grams. Second, do not fertilize the root neck. The most active part of the roots of fruit trees that absorbs fertilizer is the rapid root zone and new hair roots. Fertilization on the root neck is not conducive to absorption of fertilizers on the one hand, and on the other hand, it easily burns the roots of fruit trees, causing the leaves to gradually yellow off, affecting normal growth, and even causing the death of fruit trees. The correct method is to apply inorganic or inorganic fertilizers to the soil around the pots. Third, the application of organic fertilizer The application of organic fertilizer must be fully decomposed, otherwise fermentation in the pot will produce high temperature damage to the root system. Under normal circumstances, organic fertilizers are generally not used for top dressing. It is advisable to add sufficient organic fertilizer when preparing nutritious soil before planting.