Results of a rape plot experiment in Southeast Guizhou show that different fertilizer application rates and different NPK ratios resulted in different fertilizer recovery rates. Measured values of soil nutrients were positively related to target yield and yield in CK, but negatively to fertilizer recovery rate. Based on the formula of soil testing and fertilizer recommendation, functional relations between NPK application rate and measured valuea of soil nutrients were established, enabling reasonable fertilizer recommendation prior to sowing.