GROWTH AND YIELD OF BORO RICE AS AFFECTED BY DIFFERENT METHODS OF UREA APPLICATION

Abstract

A field experiment was conducted at the Agronomy field, Sher-e-Bangla Agricultural University, Dhaka from December 2013 to July 2014. The experiment consisted of two factors: Factor A: Variety viz. BRRI dhan28 (V 1 ) and BRRI hybrid dhan2 (V ) and Factor B: Methods of urea application viz. 100% Urea of the recommended dose (RD) was applied as 3 top dressing (T 1 ), 100% Urea of RD was applied as 3 foliar spray (T ), 100% Urea of RD was applied as 1 top dressing and 2 foliar spray (T dressing and 2 foliar spray (T 4 3 2 2 ), 75% Urea of RD was applied as 1 top ), 75% Urea of RD was applied as 3 foliar spray (T ) and 50% Urea of RD was applied as 3 foliar spray (T ), following split-plot design with three replications. The maximum number of filled, unfilled and total grains panicle 6 (155.2, 21.63 and 176.8 cm, respectively) were obtained from BRRI hybrid dhan2 while the minimum (114.4, 19.31 and 133.7, respectively) were recorded from BRRI dhan28. The maximum 1000-grain weight (23.77 g) was obtained from hybrid variety and the minimum (21.35 g) was found from the inbred variety. The highest grain yield (6.19 t ha 1 ) and biological yield (13.93 t ha -1 -1 -1 5 ), straw yield (7.74 t ha ) were recorded from BBRI hybrid dhan2 whereas the lowest (4.17, 3.53 and 7.70 t ha -1 ) were from BRRI dhan28. BRRI hybrid dhan2 has better yield potential than BRRI dhan28 in boro season. Grain yield and biological yield were not significantly influenced by methods of urea application. In the case of interactions, the highest grain yield (6.50 t ha -1 ) was observed in 100% Urea of the recommended dose (RD) was applied as 3 top dressing in BRRI hybrid dhan2. -