This project started in 1981 funded by ACGRA. CRC assumed funding until the project terminated in 1986. The aims of the project were: * to link the SIRATAC fruit model to a water balance model and to a soil and plant nitrogen balance model. *to make the SIRATAC fruit model sensitive to water and nitrogen stress. * to develop an expert system that uses data from the enhanced fruit model for pest, irrigation and nitrogen management decision making.