Author(s): L. TZUDIR, S. MAJI, S. BASU, P. S. BERA,1R. NATH AND P. K.CHAKRABORTY

Abstract: A two year experiment on four mungbean varieties sown on three different dates has been conducted at the BCKV research farm (22°56′ N latitude, 88°32′ E longitude). The wind speed at 11:30 h at the initial phase was higher under 15th February and Ist March sowings but the later phase recorded higher wind speed in case of 15th March sowing. The later phase recorded higher wind speed at 15:30 hour irrespective of dates of sowing. Wind speed over the crop was maximum when the leaf area index (LAI) was approximately 0.50. Dry matter accumulation and plant height significantly reduced the wind speed over the crop canopy. Wind speed declined when the LAI exceeded 1.15 under 15th February and 1st March sowings and 1.75 under 15th March sowing. Height over 40.8 cm reduced the wind speed of late sown crops. Biological parameters were found to be the polynomial functions of wind speed.

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