The west area of China including Sichuan

Chongqing

Guizhou

Tibet

Shanxi

Gansu

Qinghai

Ningxia

Xinjiang

Neimenggu and Guilin provide ecosystem deference for upper reaches of Changjiang River and Huanghe River

they are most important bases of agricultural products. Now

fertilizing the degenerated soils is one of the most important tasks for these areas to rebuild the ecosystem. Making full use of composts of stalks

putting organic fertilizers and inorganic fertilizers to rational use

decreasing the pollution of soils by utilization of new agricultural materials extendedly

and improving productivity of soils by combining new techniques properly are the main details of this plan.