INFLUENCE OF PLANTING METHOD AND WEEDING ON GROWTH AND VEELD OF TRANSPLANT AMAN RICE

Abstract

A field experiment was conducted at the Agronomy field. Sher-e-Bangla Agricultural University, Dhaka from July 2013 to December 2013. The experiment consisted of two factors: Factor A: Planting method viz. Rice transplanter (P 1 ) and Conventional method (112 ) and Factor 13: Weeding viz. No Weeding (W 0 ), Weeding at 20 DAT (W 1 ), Weeding at 35 DAT (W2 ), Weeding at 50 DAT (W 3 ), Two Weedings at 20 DAT & 35 DAT (W 4), Two Weedings at 20 DAT & 50 DAT (W 5 ), Two Weedings at 35 DAT & 50 DAT (W 6) and Three Weedings at 20 DAT, 35 DAT & 50 DAT (W 7 ), following split-plot design with three replications. Rice transplanter required less time (91 days) for tiowering whereas, conventional method required more time (103) days for flowering. The maximum number of filled grains panicle" and minimum number of unfilled grains panicl&' (170.82 and 27.83 respectively) were obtained from conventional method while the minimum number of filled grains panicle' and maximum number of unfilled grains panicle' from rice transplanter (158.31 and 41.61 respectively). Higher yield (5.3$ t ha') was obtained from conventional method and lower yield (4.93 t hi') from rice transplanter but they did not vary significantly. Uigher biological yield (12.92 t ha 1 ) was obtained from conventional method and the lower from rice transplanter (10.86 t ha'). In case of weeding, the highest grain yield was obtained from W 1 (5.48 t ha') and lowest from Wo (4.13 t ha'). In case of interaction between planting method and weeding, the highest grain yield obtained from P 2W7 (5.82 t ha') and the lowest from P,W 0 (3.57 t ha t)• There was no significant difference among the treatments except PIWO, PIWI and P2WO which showed significantly lower grain yield than others. As the conventional transplanting incurs more labour, using rice transplanter and weeding either at 25 DAT or 35 DAT might be suggested.