ON ESTABLISHING A OPEN SYSTEM TO DEVELOPE AGRICULTURE IN THE NORTHWEST SEMI-ARID REGION IN CHINA
建立开放系统,发展西北半干旱地区农业

The northwest semi-arid negion is one of the most undeveloped zones in China. It is characterized by the closed or simi-closed traditional organic farming with very low input, inefficient function and low output.In this paper several controvcrtille models of agriculture are discussed and some priciples for establishing a open system and concrete suggestions for developing production are presented.