A: In combination with deep-expanding and expanding fertilization, the result tree is 2 to 4 years old. After spreading under the canopy, it can be turned into a soil with a depth of about 20 cm. Large trees of 5 years old or older can be shunned and fertilized. The width of the ditch is 50 cm and the depth is 40 cm. The fertilizer and soil are mixed and filled back into the ditch, and the ditch and the tree can be alternated after the application. The disadvantage of being too concentrated in trenching and fertilization. Because the amount of medium and trace element fertilizer is small, it should be mixed with fine soil or fine sand before application.
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