EFFECT OF SEEDLINGS PER HILL ON YIELD AND YIELD COMPONENTS OF HYBRID AND INBRED RICE VARIETIES

Abstract

The experiment was conducted at the farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka during the period of July to November 2014 to find out the effect of seedlings hill -1 on yield and yield components of hybrid and inbred rice varieties. The experiment comprised of two factors. Factor A: Rice variety (2) designated as V 1 : Hybrid (Chamak); V 2 : Inbred (BRRI dhan62) and Factor B: Number of seedlings hill -1 (5 levels) named as S 1 : 1 seedling hill -1 , S 2 : 2 seedlings hill : 3 seedlings hill -1 , S 4 : 4 seedlings hill -1 and S 5 : 5 seedlings hill -1 . The experiment was laid out in split-plot design with three replications. Experimental results showed that varieties had the significant effects on plant height, number of tillers hill , dry weight hill -1 , total tillers hill -1 , panicle length, number of filled and unfilled grains per panicle, 1000 seed weight, grain yield, straw yield and harvest index. The highest grain yield (4.06 t ha -1 ) was observed from Chamak (hybrid) while the BRRI dhan62 (Inbred) gave the lowest grain yield (3.04 t ha -1 -1 ). The highest straw yield was observed from V 1

(4.67 t ha -1 ) and the lower straw yield was recorded from V 2 (4.21 t ha ). Number of seedlings hill -1 also significantly affected all the parameters under study. The maximum number of effective tillers hill -1 was found from S 2 (12.20), whereas the minimum number of effective tillers hill -1 from S 5 (10.27). The highest grain yield was found from S 2 (4.10 t ha -1 ), whereas the lowest grain yield from S 5 -1 (2.93 t ha ). The highest straw yield was found from S 2 (4.80 t ha -1 ), whereas the lowest straw yield from S 5 (4.14 t ha -1 ) which was statistically similar to S 4 (4.21 t ha ). In case of interaction effect of varieties and number of seedlings hill -1 , the highest grain yield was recorded from the combination of V 1 S 2 (4.74 t ha -1 ) and the lowest grain yield was found from V 2 S 5 (2.55 t ha -1 ) which was statistically similar with V 2 (3.79 t ha -1 ). From the above results it was appeared that Hybrid (Chamak) variety provided best yield with 2 seedlings per hill .

-1 -1 S 3 -1 -1 , S 3