EFFECT OF SOWING DATES ON YIELD AND YIELD COMPONENTS OF RAPESEED VARIETIES

Abstract

The study was carried out in the Field of Sher-e-Bangla Agricultural University farm, Dhaka to evaluate the effect of sowing date and variety on yield and yield components of rapeseed (Brassica campestris and Brassica napus). From the results it was observed that among the four sowing dates studied October 20 sowing and among the three rapeseed varieties studied BARI Sarisha-S performed best in obtaining the highest values in all the studied components of the rapeseed varieties. The results further showed that BARI Sarisha-8 performed best by producing 52.4 % and 132.9 % higher yield than BARI Sarisha-9 and Improved Tori-7 respectively. In case of sowing date, grain yield was reduced gradually with the advancement of delay in sowing. October 20 sowing gave the highest grain yield (1422 kg ha") and that of lowest (437.2 kg ha") was observed in December 4 sowing. BARI Sarisha-S on October 20 sowing showed significantly the highest grain yield (1865 kg ha") and the lowest (130 kg ha') was found in Improved Tori-7 on December 4 sowing. The variety BARI Sarisha-8 and October 20 sowing performed best in respect of grain yield as well as other studied parameters.