GROWTH AND YIELD OF AUS RICE AS AFFECTED BY AGRONOMIC MANAGEMENTS

Abstract

The experiment was conducted at the experimental field of Sher-e-Bangla Agricultural University, Dhaka during the period from March to June, 2018 to study the effects of agronomic managements on growth and yield of Aus rice. The experiment comprised as two factors having two varieties in the main plots and five agronomic managements in the sub-plots under split-plot design with three replications. Significant variation was recorded for weed severity, different yield contributing characters and yield of Aus rice. The lowest weed population (26.67 m -2 ) and weed dry weight (1.96 g m -2 ) was recorded in M

(recommended management) and M 2 (no fertilizer application), respectively, whereas the highest weed population (520.70 m -2 ) was found in the M (no management) but the highest dry weight (329.90 g m -2 ) in M (no weeding) treatment. At 30, 50, 70 DAS and harvest the taller plant (24.61 cm, 41.27 cm, 60.23 cm and 80.28 cm, respectively), grain yield (0.96 t ha -1 1 ) and straw yield (2.75 t ha -1 ) were recorded from V 2 compared to that of V . Similarly the tallest plant (27.11 cm, 49.66 cm, 71.49 cm and 91.07 cm at 30, 50, 70 DAS and harvest, respectively), grain yield (2.34 t ha -1 1 ) and straw yield (5.30 t ha ) were observed from M 4 . In respect of interaction, the highest grain yield (2.43 t ha ) and straw yield (5.31 t ha -1 ) were observed from V 1 M (BRRI dhan65 with recommended management), while the lowest grain yield (0.12 t ha 4 ) from V 1 M 0 (BRRI dhan65 with no management) and straw yield (0.85 t ha ) from V 2 M (Nerica with no management). Irrespective of variety, no management reduced 94-95% grain yield of Aus rice that was 84-89% for no weeding and no fertilizer application.