Author(s): L. Tzudir, P. S. Bera, S. Basu, R. Nath and P. K. Chakraborty

Abstract: A field experiment was conducted in the summer seasons of 2010 and 2011 on four mungbean varieties (V1 - Pant Mung - 5, V2 - Bireswar, V - RMG - 62 and V - Sukumar) sown on three different dates (D - 15th February, D - 1st March and D - 15th March) at the University research farm BCKV. The experiment was laid out in a split plot design where the sowing dates and the varieties were considered as main plot and sub plot treatments respectively. The objective of this experiment was to study the thermal regime of mungbean crop and its impact on total dry matter accumulation. Both the cumulative maximum and minimum temperature increased with the delay in sowing and varietal differences were prominent during bud emergence and pod emergence phases which might have played a crucial role in the yield of the crop. The thermal use efficiency for dry matter production increased with the delay in sowing. The mean TUE was almost similar for D2 and D3 sowings in both the years. Among the four varieties, the total HTU requirement and mean TUE was highest in case of V1 irrespective of the date of sowing and the year of observation....

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