INFLUENCE OF POPULATION DENSITY ON GROWTH AND YIELD OF INBRED AND HYBRID BORO RICE

Abstract

The experiment was conducted at the experimental field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from November 2008 to April 2009 to study the influence of four levels of population density viz. I, 2 1 , 3 and 4 seedlings hilr1 on growth and yield of inbred (BRRI dhan28 and BRRI dhan29) and hybrid (BRR1 hybrid dhan2 and ACI hybrid dhan2) boro rice. The experiment was laid out in two factors Randomized Complete Block Design with three replications. Results showed that boro rice varieties differed significantly in all growth and yield characters and hybrid dhan gave superior return in case of yield. Among the varieties ACI hybrid dhan2 produced the highest grain yield (7.66 t hi'). Two seedlings hilr' gave the maximum tillers hilr' (18.15), highest dry matter hilr' (5.23 g), maximum effective tiller hilF 1 (13.19), longest paniele (29.43 cm) and highest grain yield (6.63 t ha d) while one seedling hill' had the highest numbers of filled grains panicle (85.90), maximum 1000 grain weight (23.50 g) and highest harvest index (47.46%). Interaction result showed that ACI hybrid dhan2 coupled with transplanting 2 seedling' hill' gave the highest grain yield (8.58 t haj while ACI hybrid dhan2 in combination with I seedling hill' gave the highest harvest index (50.14%)