EFFECT OF TRANSPLANTING DEPTHS ON TILLERING AND YIELD OF HYBRID AND INBRED RICE

Abstract

A field experiment was conducted in medium fertile soil at Sher-e-Bangla Agricultural University (90º37´ E longitude and 23º77´ N latitude), Dhaka, Bangladesh during November 2017 to April 2018 in Boro season with a view to evaluating the performance of rice varieties under different transplanting depths. The experiment was carried out with three varieties i.e. BRRI hybrid dhan3, BRRI dhan45 and BRRI dhan63 in the main plot and four levels of transplanting depth viz. (2, 4, 6 and 8 cm) in the sub-plots. The experiment was laid out in a split-plot design with three replications. The combination of variety and transplanting depth had significant effects on most of the growth and yield contributing parameters. At 30, 50, 80 DAT and at harvest, the longest plant (18.20 cm, 25.72 cm, 79.86 cm, and 102.9 cm) was found from the treatment combination of V 1 D (BRRI hybrid dhan3 × transplanting at 2 cm depth), whereas the shortest (22.86 cm, 29.14 cm, 77.64 cm, and 87.55 cm) was observed from the treatment combination of V 1 3 D (BRRI dhan63 × transplanting at 2 cm depth). At 30, 50, 80 DAT and at harvest, the maximum number of tillers hill 1

(1.73, 9.80, 17.29, and 13.22) was recorded from the treatment combination of V

(BRRI hybrid dhan3 × transplanting at 4 cm depth), again the minimum number (1.20, 9.80, 14.53 and 11.00) was obtained from the treatment combination of V

(BRRI dhan45 × transplanting at 4 cm depth) at 30, 50, 80 DAT and at harvest. The longest panicle (24.49 cm) was found from the treatment combination of V , while the shortest panicle length (21.48 cm) was observed from V 3 D . The highest weight of 1000 grains (30.02 g) was recorded from the treatment combination of V 3 and the lowest weight (23.54 g) from V 3 D 1 . The highest grain yield (8.55 t ha ) was recorded from the treatment combination of V 1 D 2 and the combination of V 1 -1 D also produced statistically similar yield (8.09 t ha -1 ) whereas the lowest (5.75 t ha -1 . It may be concluded that growth, yield and yield contributing characters of Boro rice were greatly influenced by varieties and transplanting depth. Variety V (BRRI hybrid dhan3) at transplanting depth 4 cm produced longest panicle, maximum number of filled grains panicle -1 and highest 1000 grains weight and ultimately provided maximum yields of BRRI hybrid dhan3.

4 1 1 D D 4 ) from V 1 4 2 D 1 2 1 -1 D D 2 2