CADMIUM CONTAMINATION OF ZHANGSHI IRRIGATION AREA AND WAYS OF IMPROVING
张士灌区镉污染及其改良途径

Zhangshi Irrigation Area is notorious for its cadmium pollution in this country, which has bad effects in human health through food chain. So it is very imperative to adopt a comprehensive way of prevention and improvement. In this report, various methods have been summed up to decrease Cd uptake by rice plant during 1980-1983. They are by:1. Reducing Cd concentration and increasing pH value in irrigation water,2. Applying soil supplement materials: lime, Ca-Mg-P fertilizer, etc.,3. Taking off polluted surface soil at different depth or covering the polluted top soil with unpolluted one,4. Biological methods: in addition to rice, other kinds of crops are planted, such as soybean, corn, sunflower, etc. and using Cd-polluted rice as breed good strains.These experiments have been carried out in polluted fields. And, conclusions are, of course, suitable for this particular area.