Using three kinds of solid wastes improving barren soil

Using fly ash, phosphogypsum and sludge can make the utmost use of resources to improve the barren soil, because the three kinds of solid wastes include nutrients which are needed by plants. According to pH value and nutrients of the three kinds of solid wastes, the authors carry on a lot of experiments and theoretical calculations to determine the best formula of the soil improvement. The experimental results show that the improved soil can achieve to the standard of national second class soil, and it can even achieve to the standard of national first class soil, if the soil conditioner can be controlled within 20%.