A two year experiment was conducted at the BCKV with four mungbean varieties (Pant Mung-5, Bireswar, RMG-62 and Sukumar) sown under three dates (15 th February, 1 st and 15 th March) in a split plot design where dates of sowing and varieties were allotted to main and sub plot treatments respectively with three replications. PAR was recorded with the help of line quantum sensor. Dry matter accumulation, yield attributes and yield were measured. Canonical correlation and correspondence analysis showed that absorbed PAR during 32 to 46 days after emergence (DAE) increased dry matter, pod and seed yield. PAR use efficiency (PARUE) of mungbean ranged from 0.75 to 0.88 g MJ -1 for seed yield. PARUE for dry matter production was maximum during 39 to 46 DAE. According to PARUE and heat use efficiency, Pant Mung-5 should be sown within 1 st March in this zone. Growing degree day requirement gradually increased with delayed sowing.
Temperature change with concomitant change in canopy temperature influences crop growth and productivity. A three year (2005-06 to 2007-08) experiment was carried on wheat varieties PBW 343, HD 2733, HW 2045, PB 533 and K9107 in subplot treatments sown on three dates of 18 th November, 3 rd and 18 th December in main-plot treatments in a split-plot design with three replications. Canopy temperature was measured at CRI, tillering, flowering and milking and stress degree day index was computed. Late sown crop experienced highest canopy temperature, varieties of K 9107 and HW 2045 recorded lowest and highest respectively. Canopy temperature and stress degree day index significantly and negatively correlated to dry matter accumulation in leaf, stem and ear at different phenophases. Grain yield reduce significantly with the delay in sowing. Canopy temperature at 11.30h during CRI, tillering or flowering stages significantly and negatively affected grain yield.
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