Abstract: Researehes had been carried out during 1988—1989 in Shaoxing and Qu eounties of Zhejiang pravince for the nutrient balance, economic benefits and soil fertility of farmland ecosystem under 5 different kinds of multi-cropping systems. As the result indicates, the grain praduction and crude protein content under the wheat-rice-soybean system are highcr.This system is also characterized by better investment profits, improvement of soil aeration and nutrient release, whlch has broad pro-pects for development.

Key words: Rhodotorula graminis, crystal violet, malachite green, biosorption