Jaderick P. Pabico wrote ... >>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 I have include the header for the RICER960.CUL file, which contains information in the header regarding the coefficients. This information is also available in Volume 2 of the DSSAT users guide. This is a repost for those who could not read the attachment on my previous reply. I know, I know, it seems like this listserver is getting SPAMMED a lot recently! *GENETICS PARAMETER INPUT FILE - RICE GENOTYPE COEFFICIENTS ! ! P1 - Time period (expressed as growing degree days [GDD] in =F8C = above a base ! temperatue of 9=F8C) from seedling emergence during which the = rice plant ! is not responsive to changes in photoperiod. ! P2O - Critical photoperiod or the longest daylength (in hours) at which the ! the development occurs at a maximum rate. ! P2R - Extent to which phasic development leading to panicle initiation is ! delayed (expressed as GDD in =F8C) for each hour increase in photoperiod ! above P2O ! P5 - Time period in GDD (=F8C) from beginning of grain filling (3 to = 4 days ! after flowering) to physiological maturity with a base temperature of 9=F8 ! G1 - Potential spikelet number coefficient as estimated from the number of ! spikelets per g of main culm dry weight (less leaf blades and sheaths ! plus spikes) at anthesis. ! G2 - Single grain weight (g) under nonlimiting conditions. ! G3 - Tilering coefficient (scalar value) relative to IR64 cultivar under ! ideal conditions. ! G4 - Temperature tolerance coefficient. Usually 1.0 for varieties grown in ! normal environments. G4 for Japonica type rice growing in warmer ! environments would be 1.0 or greater. Likewise, G4 for Indica type ! rice in cool environments would be < 1.0. ! ----------------------------------------------- Dr. Paul W. Wilkens Scientist, IFDC P.O. Box 2040 Muscle Shoals, AL 355662 (205) 381-6600 (phone) (205) 381-7408 (fax) E-mail [log in to unmask] ----------------------------------------------- >