A five year field experiment was conducted to get information which will facilitate the scientific development of tree mixtures in an agroforestry system with two fruit trees viz., mango(Mangifera indicaL.) and cashew(Anacardium occidentaleL.) and four tropical nitrogen fixers viz.,Acacia auriculiformis, Acacia holosericea, Casua-rina equisetifoliaandLeucaena leucocephala.Observations on biometrics and edaphic parameters were recorded. Enhanced growth of cashew and mango was observed when coplanted with casuarina and leucaena, respectively. The enhanced height growth of cashew by 25% is recorded when interplanted with casuarina and plant girth (10.8 cm) was maximum when interplanted with leucaena. About 11% increase in height growth of mango was registered when interplanted with leucaena. The investigation identified two nitrogen fixers namely casuarina and leucaena for coplanting in cashew and mango orchards, respectively in the initial establishment Stage.