I'm also interested in knowing the correct reference of a paper delivered in the summer course at Univer. Florida last year: Authors:Kropff, Williams, Horie, Angus, Singh, Centeno e Cassman Title: Predicting yield potencials of rice in different environments Subject: The paper presents results of validation of CERES rice, Oryza1, SIMRIW and TRYM models in IRRI, Yanco and Japanese condictions. Which date? Where published (if)? thanks for any help! ricardo