* Present address: Department of Plant Physiology, SKN College of Agriculture, Johner-303329, Jaipur.
Dry matter accumulation and growth of four Brassica cultivars viz., Pusa Kalyani (B. campestris), Vamaa. (B. juncea), BO-15 (B. napus) and BS-2B-84 (B. carinata) under three photoperiods were analysed during rabi seasons of 1985 and 1986. Maximum bio-mass and pod weight was produced by BS-2B-84 under natural day (NO). For the other cultivars either long day (LD) or natural day was more favourable than short day (SD) for boimass and pod mass at different growth stages. Natural day was responsible for maximum CGR and NAR in Pusa Kalyani, Varuna and BS-2B-84 while in BO-15 LD was most conducive. The highest LAI was attained in BS-2B-84 followed by Pusa Kalyani, BO-15 and Varuna. Basis of difference in biomass production seemed to be LAI and/or NAR which were linearly related.
