The present investigation was carried out during Kharif season of 2005-06 to investigate the
CERES 3.5v model validations for rice at different dates of transplanting and different varieties.
Treatment consisted of three varieties viz. Sarjoo-52, NDR-359 and Pant Dhan-4, two dates of
transplanting viz. July 5th, 2005 and July 25th, 2005 & three nitrogen levels viz. 80 kg/ha, 120 kg/
ha and 160kg/ha. The experiment was laid out in randomized block design (RBD). Among the
genotypes, prediction accuracy of Pant Dhan-4 was found better in respect of no. of tillers/m2,
50 % flowering (DAT), panicle initiation (DAT) and physiological maturity (DAT) were better
on 5th July transplanting at120 kg/ha nitrogen in comparison to 25th July transplanting. The
simulation modeling was subsequently validated against observed data from field experiment.
From the response of simulation model it is observed that accuracy of simulated value decrease
with late sowing in all the varieties.