Abstract: The QUEFTS (QUantitative Evaluation of the Fertility of Tropical Soils) model was calibrated for summer maize using the soil fertility data and fertilizer trials results at different sites in Huanghe-Huaihe-Haihe Plain. The essence of QUEFTS model takes into accoun of the interactions among nitrogen (N), phosphorus (P) and potassium (K). QUEFTS describes the relationship between soil parameters and yield in four steps: (1) assessment of the potential supply of N, P and K on the basis of chemical soil data; (2) calculation of the actual uptakes of N, P and K, as functions of the potential supplies determined in step 1; (3) designation of yield ranges as functions of the actual uptakes of N, P and K determined in step 2;(4) calculation of the ultimate yield estimate by combining the three yield ranges established in step 3. New equations were established in step 1. The relationships between N, P and K recovery fractions and their applied amount were established, respectively. The contents of minimum and maximum accumulation (kg grain kg-1) of N, P, and K for summer maize are set to（21-64）,（126-384）and（20-90）,respectively. The simulated values showed a good consistence with the observed one.

Key words: QUEFTS, Soil ingenious fertility, Fertilizer applied, Nutrient uptake, Summer maize yield