Courtyard soil, especially the soil in urban courtyards, is generally mixed with garbage left over from construction. Before planting, appropriate soil shall be replaced, or the soil shall be deeply turned to remove construction waste, so as not to affect the normal growth of plants. Therefore, when planting fruit trees and woody flower wells, the depth should be at least 50cm deep. In the case of a stream of yard soil, the soil layer has not yet matured, and attention should be paid to applying more organic fertilizer to improve the soil before planting plants. After planting, a small amount of topdressing shall be applied for many times to meet the needs of plants for fertilizer. Another
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