STUDY ON PLANTING METHODS AND NITROGEN SPLITTINGS IN CULTIVATING BORO RICE

Abstract

A field experiment was conducted at the Agronomy field of Sher-e-Bangla Agricultural University (SAU), Dhaka, during the period from December 2014 to July 2015 to study the growth and yield of BRRI dhan29 in boro season as affected by three planting methods and seven levels of N-splitting in boro season under the Modhupur Tract (AEZ-28). The experiment was comprised of two sets of treatments viz. Factor-A. (Planting method): conventional transplanting (M 1 ), drum seeder (M 2 ) and rice transplanter (M ) and Factor-B. (N-splitting): 100% Urea of the recommended dose (RD) applied as 3 top dressing (T ii

3 ), 100% Urea of RD applied as 1 top dressing and 2 foliar spray (T 2 1 ), 100% Urea of RD applied as 3 foliar spray (T ), 75% Urea of RD applied as 1 top dressing and 2 foliar spray (T ), 75% Urea of RD applied as 3 foliar spray (T 5 4 ), 50% Urea of RD applied as 1 top dressing and 2 foliar spray (T ) and 50% Urea of RD applied as 3 foliar spray (T ). The experiment was laid out in a split-plot design replicated thrice assigning planting method in main plot and nitrogen splitting in the sub-plot. The maximum number of rachis branch 7 -1 , filled grain and total grains panicle -1 and 1000-grains weight (10.15, 158.20, 175.57 and 23.43g respectively) were found in drum seeder while the minimum (9.81, 149.43, 165.57 were 22.33 respectively) were recorded from rice transplanter. The highest grain yield (8.09 t ha -1 ), straw yield (6.88 t ha -1 6 ) and biological yield (14.97 t ha ) were recorded from drum seeder whereas the lowest (7.33, 6.43 and 13.76 t ha respectively) were found from rice transplanter. Grain yield and biological yield were significantly influenced by N-splitting where the highest grain yield (8.26 t ha -1 -1 ) and biological yield (15.02 t ha ) were observed in T 1 but the highest straw yield (7.03 t ha -1 ) in T 3 . The highest grain yield (8.68 t ha was observed in combined effect of drum seeder and 75% Urea of RD applied as 1 top dressing and 2 foliar spray that was similar (8.60 t ha -1 ) with the same planting method having recommended dose of nitrogenous fertilizer applied as three top dress (M

2 T 1 ).