Supplementing herbicides with manual weeding improves weed control efficiency, growth and yield of direct seeded rice
2013
Khaliq, A. (University of Agriculture, Faisalabad (Pakistan). Dept. of Agronomy) | Matloob, A. (University of Agriculture, Faisalabad (Pakistan). Dept. of Agronomy) | Ihsan, M.Z. (University of Agriculture, Faisalabad (Pakistan). Dept. of Agronomy) | Abbas, R.N. | Aslam, Z. | Rasool, F.
Supplementing herbicide application with manual weeding in dry seeded rice fields can help control weeds more effectively. To test this assumption, pre and post-emergence herbicides applied either alone or supplemented with manual weeding were evaluated in a field study. Pendimethalin at 1137 g a.i. per ha as pre-emergence (0 DAS), bispyribac sodium, penoxsulam, pyrazosulfuron ethyl and ethoxysulfuron ethyl at 30, 15, 30 and 30 g a.i. per ha, respectively, as early post emergence (15 DAS) were applied alone and supplemented with manual weeding (hoeing/pulling, 30 DAS). A weedy check and manual weeding thrice (15, 30 and 45 DAS) were included for comparison. Data on weed dynamics and crop attributes were recorded following standard procedures. Weed density and biomass was significantly reduced under sole application of herbicides; nonetheless supplementing herbicides with manual weeding further reduced both of these attributes to a much larger extent. Bispyribac sodium recoded higher weed suppression when it was followed by manual weeding. Positive efficiency indices of different weed management treatments were also observed in the study. Significant improvement in rice growth and grain yield was recorded when herbicides were followed by manual weeding. Bispyribac sodium and ethoxysulfuron ethyl followed by manual weeding recorded similar grain yields. Rice growth and yield was negatively associated with weed density and biomass, and unrestricted weed growth incurred 75% yield loss in dry seed fine rice. Combination of bispyribac sodium and manual weeding was the best integrated weed management strategy to control weeds and enhance growth and yield of rice.
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