RESPONSE OF BRRI dhan29 TO DIFFERENT DOSES OF NITROGEN AND LEAF CUTTING

Abstract

An experiment was conducted during December 2020 to May 2021, at the research field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh to examine the response of BRRI dhan29 to different doses of nitrogen and leaf cutting. The experiment consisted of two factors, and split plot design was followed.Factor A: Different nitrogen doses (Three) viz:N 1 = 138 kg nitrogen ha -1 , N 2 = 163 kg nitrogen ha -1 , N 3 =183 kg nitrogen ha -1 and Factor B: Leaf cutting at different days after transplanting DAT (Four) viz: C 0 = No leaf cutting (Control), C 1 = Leaf cutting at 25 DAT, C 2 = Leaf cutting at 55 DAT. The Experiment results showed that different nitrogen doses and leaf cutting either individually or interaction showed significant variations in respect of various parameters inBRRI dhan29. In respect of different nitrogen doses, the maximum number of effective tillers hill = Leaf cutting at 40 DAT and C 3 -1 (15.96), flag leaf area (58.62 cm 2 ), panicle length (24.94 cm), filled grains panicle -1 (143.45), total grains panicle -1 (163.19), 1000 grains weight (26.24 g), absolute grain growth rate (7.75 mg day -1 ), grain yield (7.67 t ha -1 ), straw yield (9.06 t ha -1 ), biological yield (16.73 t ha -1 ) and harvest index (45.83 %) were recorded in N 3 treatment. In respect of leaf cutting the maximum number of effective tillers hill

(17.72), flag leaf area (58.79 cm (145.75), total grains panicle -1 2 ), panicle length (25.99 cm), filled grains panicle (164.78), 1000 grains weight (28.39 g), absolute grain growth rate (8.67 mg day -1 ), grain yield (7.66 t ha -1 ), straw yield (9.17 t ha ), biological yield (16.83 t ha -1 ) and harvest index (45.45 %) were recorded in C 0

treatment. In case of combined effect N 3 (Application of 183 kg nitrogen ha ) treatment along with C 0 (no leaf cutting) treatment showed the maximum number of effective tillers hill -1 (19.10),highest flag leaf area (63.22 cm 2 ), panicle length (27.67 cm), filled grains panicle -1 (154.63), total grains panicle -1 (171.83), 1000 grains weight (30.20 g), absolute grain growth rate (9.67 mg day -1 ), grain yield (8.54 t ha ), straw yield (9.62 t ha -1 ), biological yield (18.16 t ha -1 ), harvest index (47.03 %). Finally the treatment combination N 3 was best for the production of higher grain yield compared to others treatments in BRRI dhan29 rice variety.

C 0 -1 -1 -1 -1 -1