Urban landscape greening produces a large number of defoliation every day. Defoliation is a very good organic fertilizer raw material, and the price is low. The content of nutrients in leaves is quite high. When deciduous leaves are applied as organic fertilizer, the soil can be improved, the content of organic matter in soil can be increased, the aeration condition of soil can be improved, the fertilizer and water conservation ability of soil can be improved, and the acidity and alkalinity of soil can be regulated.
According to the determination, apple leaves contain 3%-6%, 0.2%-0.3% phosphorus, 2% potassium and many trace elements; pear leaves contain 2%-2.2% nitrogen, 0.1%-0.25% phosphorus and 1.2%-2.6% potassium. Normally, after the full fruit stage, the nitrogen contained in the leaves of the whole tribe in each mu of pear orchard is equivalent to 98 kg of ammonium bicarbonate, 12 kg of superphosphate and 20 kg of potassium carbonate. These manufactured organic fertilizers, rich in organic matter, can be used to plant flowers, grass, but also to cultivate vegetables. Stacking deciduous leaves on tree roots can also improve the status of soil poverty. If all the tribal leaves of a tree were used as organic fertilizer, the tree would not need additional chemical fertilizer.
The nutrients in deciduous leaves are converted into organic fertilizer easily absorbed by plants through composting, which is harmless to plant growth and alkaline. There are great differences in nutrient content and C/N ratio in deciduous leaves of different plants. According to the actual content of raw materials, proper amount of high nitrogen substance is added to adjust C/N ratio and microbial agent to accelerate composting maturity process. The recovery and utilization of organic fertilizer from defoliation reduces the amount of chemical fertilizer applied, improves the quality of green soil, and realizes the recycling of material metabolism in gardens.