Main Technical Measures for Soil Improvement After Land Remediation

1. Lime application to adjust soil pH.
When the soil pH is less than 5.5, 100-150 kg of lime should be applied per mu to adjust the pH so that the soil pH is between 5.5 and 6.5 to improve the absorption and utilization of nutrients. 

2. Increase the application of organic fertilizers, improve soil permeability.
Soil organic matter content of less than 1.5% of the plot, mu application of well-rotted organic fertilizer 1500 ~ 2000 kg, straw 300 ~ 500 kg, not only can improve the physical and chemical properties of the soil, to promote early crop development, and is conducive to the return of nutrients and balance.

3. Implement water-dry rotation, balance soil nutrients.
Through water-dry rotation, soil water conductivity is enhanced and texture is reduced, which is conducive to soil aeration and permeability and balance of soil nutrients.

4. Improving guest soil to enhance arable properties.
After land remediation, adding sandy soil, humus or pond mud soil can effectively enhance soil tillage and improve the water and fertilizer retention capacity of soil.

5. Plant green fertilizer to improve fertility.
Green manure has a well-developed root system, which can penetrate the tighter middle and lower layers of soil and play the role of increasing the tillage layer and loosening the soil. Moreover, green manure has large growth and high plant carbon to nitrogen ratio (C/N), which can enhance the soil carbon to nitrogen ratio after tilling, increase the soil organic carbon content and improve the soil fertilizer supply capacity.