INFLUENCE OF PLANTING MATERIAL AND VARIETY ON YIELD OF BORO RICE

Abstract

A field experiment was carried out at Agronomy Field, Sher-e-Bangla Agricultural University, Dhaka during the period from December, 2008 to May, 2009 to study the growth and yield of inbred and hybrid rice in boro season using mother plant and clonal tillers. The experiment consisted of two level of treatments viz. planting material and variety. The experiment was laid out in split-plot design with three replications. Experimental results showed that planting material significantly influenced all the studied characters such as panicle length, unfilled grains panicle -1 , total grains panicle , 1000 grains weight, grain straw ratio and harvest index. The results revealed that mother plant showed the better performance compared to clonal tillers. The higher grain yield (6.85 t ha -1 ) and straw yield (6.45 t ha -1 ) was obtained from the mother plant and the lowest grain yield (4.47 t ha -1 ) and straw yield (4.59 t ha -1 ) was obtained from clonal tillers. Maximum biological yield (13.31t ha -1 ) was calculated from the mother plant and minimum biological yield (9.06 t ha -1 ) was found from the clonal tillers. Variety had significant effect on all the agronomic parameters except number of effective tillers, ineffective tillers, total tillers, grain straw ratio and biological yield. BRRI hybrid dhan 2 produced the highest dry grain yield (5.92 t ha -1 ); the lowest straw yield (4.97 t ha ), whereas, BRRI dhan29 produced the lowest grain yield (4.16 t ha -1 ); and highest dry straw yield (6.70 t ha -1 ). The maximum harvest index (56.50 %) was found from BRAC aloron and the lower harvest index (37.67%) was found from BRRI dhan29. The harvest index was 33.32% higher in BRAC aloron compared to BRRI dhan29. The interaction effect of planting material and variety showed significant variation for tillers m -2 , panicle length, unfilled grains panicle -1 , total grains panicle -1 , 1000 grains weight, grain straw ratio and harvest index. Clonal tillers had the potentiality to produce similar effective tillers m , grain wt. and harvest index as mother plant though the highest grain yield (7.80 t ha -1 ) was given by mother plant of hybrid variety Sonarbangla-6 that similar to the mother plant of BRRI hybrid dhan2 (7.67 t ha -1 ) and mother plant of BRAC aloron (7.28 t ha -1 ).

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