Fellow Subscribers: I found that the genotype file RICER940.CUL is not the same as that of the SBGRO940.CUL with respect to defining the variables listed. The SBGRO940.CUL file has an accompanying description of the variables it contain while RICER940.CUL does not. In this regard, may I ask those who are experts on this matter what are the respective definitions and the units used of the following CERES-Rice cultivar coefficients: P1 P2R P5 P20 G1 G2 G3 G4 Thank you in advance... _____________________________________________________________________ Jaderick P. Pabico DU-1-JDE, 145.030 MHZ http://www.bae.uga.edu/dept/grads/jpabico/ [log in to unmask],edu The trouble with doing something right the first time is that nobody appreciates how difficult it was.