Dear list members, I have been using CERES-Wheat to simulate yield components of cultivar Newton in Kansas, USA. Simulated Kernels per area and grain yield are satisfactory, but while there is a clear variation in observed kernel weight simulated kernel weight is a constant value (a horizontal line in the Simulated vs Observed figure). Has anyone else seen this response? For the simulations I have used the genetic coefficients found in Tsuji, Jones & Balas (eds.). 1994. DSSAT version 3, Vol. 2. Univ. Hawaii, and also included in file Whcer940.cul: P1V: 6.0 P1D: 2.5 P5: 3.5 G1: 3.4 G2: 2.6 G3: 1.4 PHINT: 95.00 Has anyone else used/tested these coefficients for Newton? Has anyone else determined a “revised” set of coefficients? Thanks for your time and comments. Regards, Alex ----------------------------------- Alex Moreno Sotomayor Graduate Research Assistant 236 L.W. Chase Hall / PO Box 830728 School of Natural Resource Sciences University of Nebraska - Lincoln Lincoln NE 68583-0728 Fax (402) 472-6614 -----------------------------------