1. Since the root groups of trees are widely distributed, the nutrients and moisture are absorbed in the fibrous roots. Therefore, fertilization should be done around the roots and not near the trunk. 2. The trees with strong roots and deep distribution should be deep-fertilized and the scope should be large, such as pine, ginkgo, skunk, acacia, etc.; shallow root trees should be applied to shallower fertilization, and the range should be small, such as Fatong and Amorpha fruticosa. And flower shrubs and so on. 3. The organic fertilizer should be fully fermented and decomposed, and raw manure should not be used. The concentration should be diluted. The chemical fertilizer must be completely crushed into powder and should not be applied in blocks. 4. After fertilization (especially chasing chemical fertilizers), water must be fed in a timely manner so that the fertilizer can seep into the soil. 5. Fertilizer should be selected when the weather is clear and the soil is dry. Rainy days, due to the slow absorption of water by roots, not only can the nutrients be easily absorbed, but the fertilizer can also be washed away by rain, causing waste. 6. Sand, sloping land and rocks are prone to loss of nutrients and fertilization should be deeper. 7. Nitrogen fertilizer has a strong mobility in the soil, so shallow application penetrates into the root distribution layer and is absorbed by the trees. Potassium fertilizer has poor mobility and the mobility of phosphate fertilizer is worse, and it should be applied deepest to the root system. 8. The basal fertilizer should be applied deeper because of its slower development of the fertilizer effect, and the top dressing fertilizer effect is faster. 9. Foliar spraying fertilizer enters the leaves through the stomata and stratum corneum, and then is transported to various organs. Generally, the young leaves are older than the old leaves, and the leaves do not absorb water faster than the leaves, and the absorption rate is also high. Therefore, the actual spray must be sprayed evenly on the back of the leaf, so that it is beneficial to the absorption of the trunk. 10. The foliar spray fertilizer should strictly control the concentration so as not to burn the leaves. It is better to spray on cloudy days or before 10 o'clock in the morning and after 4 o'clock in the afternoon to avoid high temperatures and rapid solution concentration, affecting spray fertilizer or causing phytotoxicity. 11. When fertilizing fertile land in urban gardens, when selecting fertilizer types and fertilizing methods, it should be taken into account that fertilizers that do not affect urban sanitation and emit odors should not be applied.
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