Field experiments were conducted at PAU, Ludhiana, to study growth and radiation interception in raya PBR-91 sown under three dates of sowing during two consecutive rabi seasons of 2004-05 and 2005-2006. The leaf area index (LAI) depicts a positive correlation with the photosynthetically active radiation (PAR) interception, GDD and HTU. Significant linear positive relationship was also observed between dry matter accumulation with PAR interception, growing degree days (GDD), heliothermal units (HTU).