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Pakistan Journal of Biological Sciences
Year: 2003  |  Volume: 6  |  Issue: 12  |  Page No.: 1067 - 1069

Study on Growth and Control of Weeds as Affected by Weeding Methods in Upland Direct Seeded Aus Rice

M. Robiul Alam, M.S.H. Molla, M. Shahjahan, M.O. Hoque, M. Akhtar Hossain and F. Islam    

Abstract: The research work was conducted to observe weed vegetation and to ascertain the comparative control efficiency of weeding methods in upland direct seeded Aus rice. Weed density was affected significantly by weeding methods at 60 days after sowing. The highest weed density (149.14 m–2) was observed in control plot. The lowest weed density (77.64 m–2) was recorded in T6 (ronstar @ 2.5 L ha–1) treatment and the second lowest density of weed was attained from T5 (ronstar @ 2.0 L ha–1) and T2 (Two hand weeding) treatment. Most of the weed species infested in experimental plots were graded as good control in T6 (ronstar @ 2.5 L ha–1), T5 (2.0 L ha–1) and T2 treatment. But the application of ronstar @ 2.5 L ha–1 resulted in phytotoxic effect and rice plants were short statured and flowering was delayed. Moreover conventional two hand weeding method was observed very much laborious, time consuming and less cost effective for controlling the weeds. It was evident that the application of ronstar @ 2.0 L ha–1 was found the easiest and economically viable method for controlling different weed species grown in upland direct seeded Aus rice.

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