Abstract: In this paper, grey correJational analysis is introduced into AHP method to deal with problems concerning alternate presence of qualitive and quantitative factors. And then. four models of forest-rubber-popper are evaluated and optimized using this AHP method. From the comprehensive consideration of economic, ecological and social benefits, the forestrubber-pepper combining model is selected as a successful model of multi-layer cultivation, which is valuable to be popularized.

Key words: simulated soil column, paddy soil, fertilizer nitrogen, translocation, transformation, fertilizer micro-region