SCREENING OF RICE VARIETIES RESPONSIVE TO SYSTEM OF RICE INTENSIFICATION (SRI) IN BORO SEASON

Abstract

A held experiment was carried out at Agronomy research field. Sher-e-E3angla Agricultural University. [)haka. Bangladesh. during the period hi oni December, 2010 to May 2011 for the screening of rice varieties responsive to SRI in how season. Iiie experiment consisted of sixteen treatments viz. 8R3 (V (V1) BR16 (V 1 ). BRRI dhan28 (V 4 ). BRRJ dhan29 (V5). I3RRI dhan36 (V). BRRI dhan45 (V 7 ). BRRI dhan50 (V 8). Binadhan-6 (V 9 ). Bina new line (V I()). BRRI hybrid dhan 1 (V 11 ). BRRI hybrid dhan2 (V 12 ). BRRI hybrid dhan3 (V 13 ), Chaniak (V 4 ). I lira I (V 1 5) and Rhajan (V 16 ). the experiment was laid out in randomized complete block design with three replications ..[xperinenta1 results showed that the sixteen varieties cultivated in horo season had significant difthrence among them in all agronomic parameters except plant dry weight at harvest, root dry weight at 90 DAT and at harvest. leaf area index at 90 DAT. The lowest seedling mortality rate was for Channik (1.1 1%) at 7 DAT and Bhajan (0.74%) at 14 DAT. BRRI dhan28 had the highest seedling mortality rate at both 7 l)A'l and 14 DAT (12.95% and 9.61%). BRI4 had the highest tiller number hillS' at 90 DAT (32.80) and at harvest (26.37). BR 16 had the highest number of effective tillers hill" (27.33) and highest grain yield (6.86 ha"), lIinadhan-6 had the highest number of total grains panicle" (222.70) and number of tilled grains panicle" (191.00). BR3 and BR 14 both had the highest 1000-grain weight (30.63 g). BRRI hybrid dhan2 had the highest straw yield (7.70 t ha') and biological yield (13.24 t ha"). BRRI dhan50 had the highest harvest index (49.30).