The condidition of entrophicated waterbodies in the Three-Gorges Reservoir Area is described, according to the characteristic, several technical apporachs to prevention and treatment of entrophication in the Three-Gorges Reservoir Area, using bioremediation technology, and the feasibility of using floating-beds rice technology in entrophication in the Three-Gorges Reservoir Area.

Laboratory-scale continuous purification of ammonia-type eutrophic water body by Oenanthe decumbens on floating-beds at a low water temperature;

Inoculating plate drop-wise with 1 ml of Agrobacterium suspension cells and co-cultivation for 3 days or until visible Agrobacterium colonies showed up resulted in a high transformation potential for the rice suspension cells.

According to the theory of nonlinear programming and interval estimation,an optimization model for application of fertilizer in rice seedling bed soil was suggusted,and the operational method was given.