Effect of GA3 and row ratio of restorer (R) and CMS lines (A) on different characters and seed production of BRRI Hybrid Dhan2

Abstract

An experiment was conducted at the experimental farm of Bangladesh Rice Research Institute (BRRI), Gazipur, during November to May 2009-10 to study the effect of GA₃and row ratio of restorer and CMS lines on different characters and F₁ seed production of BRRI hybrid dhan². The treatments were of four levels of GA₃ viz., (i) control, (ii) 150 g/ha, (iii) 250 g/ha, and (iv) 350 g/ha and five row ratios (R:A) viz., (i) 2:8, (ii) 2:10, (iii) 2:12, (iv) 2:14, and (v) 2:16. Different doses of GA₃ ignificantly influenced growth and yield components of rice except total tillers/hill and 1000-grain weight. The highest F₁ seed yield (2.34 t/ha) of BRRI hybrid dhan² was obtained with an application of GA₃ @ 250 g/ha which enhanced the maximum number of effective tillers, the highest number of grains/panicle, panicle exsertion rate and outcrossing rate. The lowest seed yield (1.10 t/ha) was produced without application of GA₃ i.e., control. The row ratio of 2:12 and 2:8 produced the highest (2.05 t/ha) and the lowest (1.63 t/ha) F1seed yield, respectively. The interaction between GA₃ and row ratio of restorer and CMS lines was significant for F₁ seed yield. The highest F₁ seed yield (2.90 t/ha) was obtained with the application of GA₃ @ 250 g/ha at the row ratio of 2:12 (R: A). The lowest seed yield (0.95 t/ha) was recorded without application of GA₃ (control) at row ratios of 2:16.

DOI: http://dx.doi.org/10.3329/bjar.v37i4.14391

Bangladesh J. Agril. Res. 37(4): 665-676, December 2012