Biological coverage: The amount of evaporation after the cover is significantly reduced, which can maintain the soil moisture, prevent soil erosion and salt, increase the content of organic matter in the soil, and prevent the growth of weeds. The specific approach is: in the orchard, straws, weeds, and green manure covered under cover must be covered with 5 to 20 centimeters of mulch, which will not be covered in underground all year long. In areas where grass is abundant, we will strive to cover the whole park. Where there is not enough grass source, only the tree plate can be covered, but the thickness must meet the requirements. After covering, do not sprinkle soil on the grass so as not to affect the air permeability after covering. Plastic film coverage: After covering, it can reduce the evaporation of soil moisture and has a significant effect. At the same time, the deep layer of soil moisture can be referred to the tillage layer to increase the soil moisture content, which has a greater effect on improving the soil temperature in the early stage and improving soil physical and chemical properties. Since the reflected light and scattered light are increased after the film is covered, the light between the strains is improved, which is extremely favorable for photosynthesis and fruit coloring. In the spring after the rain, the trees should be covered by the tree line, remove the film during the autumn fertilization and clean up, to prevent the waste film into the soil and affect root growth.
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