| In this study, effects on water and nutrition use efficiency under different water and nutrient management approaches in the intercropping system between peanut and foxtail millet were investigated through the “3414” design of water, nitrogen and phosphorus. The results showed that under rich levels of nitrogen and phosphorus, water use efficiency of peanut leaves showed a declining tendency and the water use efficiency of foxtail millet leaves was first increased but subsequently went dropped, with the enhancement of soil moisture. The peanut and foxtail millet water use efficiency went up first but down afterwards with the increase of other fertilizer, when they were under rich water and fertilizer. The high correlations were observed between peanut nitrogen accumulation and nitrogen application, peanut phosphorus accumulation and phosphorus accumulation, millet nitrogen, phosphorus or potassium application and soil moisture. In addition, high correlations were also found between peanut nitrogen accumulation and potassium accumulation, peanut phosphorus accumulation and potassium accumulation, foxtail millet phosphorus accumulation and nitrogen accumulation, foxtail millet phosphorus accumulation and potassium accumulation, foxtail millet phosphorus accumulation and potassium accumulation, peanut nitrogen accumulation and millet phosphorus accumulation, peanut and foxtail millet phosphorus accumulation, peanut and foxtail millet potassium accumulation, peanut phosphorus accumulation and foxtail millet phosphorus accumulation. When two other factors were at rich levels, nitrogen, phosphorus and potassium use efficiencies in peanut and foxtail millet were firstly increased but decreased subsequently with the increase of soil moisture. With the increase of nitrogen application rate, nitrogen and potassium use efficiencies in peanut and foxtail millet were firstly increased but then dropped, while an increasing trend of foxtail millet phosphorus use efficiency was observed. However, the correlation between peanut phosphorus use efficiency and nitrogen level was not obvious. Nitrogen, phosphorus and potassium use efficiencies of peanut and foxtail millet were firstly elevated but then decreased with the increase of phosphorus application rate. |