Vol. 5, Issue 4 (2017)
Bio-efficacy of new herbicide combination (Bispyribac sodium 4% SE + Metamifop 10% SE) on weed control, economics and profitability of direct seeded rice
Author(s): R Sathya Priya, C Chinnusamy, P Murali Arthanari and P Janaki
Abstract: Direct seeded rice (DSR) is gaining momentum in India due to high demand of labour during peak season of transplanting and short period availability of water. Weed management is a major factor contributing a considerable share to the cost of production and deciding the final yield, especially in DSR as the crop and weeds emerge simultaneously due to which the crop suffers competition even from early stage of growth which in turn reduces the grain yield. Weeds are the main biological constraints to its success. Field experiments were conducted in the rabi season of 2013 and 2014 to study the new formulation of herbicide combination bispyribac sodium 4% SE + metamifop 10% SE against weeds in DSR and their residual effect on succeeding crop. Results revealed that the post-emergence (POE) application of herbicide combination bispyribac sodium 4% SE + metamifop 10% SE at 70 g a.i. ha-1 + wetter at 100 ml ha-1 gave significantly lower total weed density (25.78 plants m-2 in 2013 and 24.19 plants m-2 in 2014), total weed biomass (24.89 g m-2 in 2013 and 34.56 g m-2 in 2014) and higher weed control efficiency (80.07% in 2013 and 81.68% in 2014) at 40 days after herbicide spray (DAHS). Application of bispyribac sodium 4% SE + metamifop 10% SE at 70 g a.i. ha-1 + wetter at 100 ml ha-1 as POE herbicide can keep the weed density and dry weight below the economic threshold level and increase the grain yield of 5676 and 6388 kg ha-1 in DSR. Economic analysis of weed management practices in DSR revealed that the higher gross and net return (` 68,112 ha-1and ` 43,662 ha-1in 2013; ` 76,656 ha-1 and ` 51,506 ha-1 in 2014) were realized in the treatment of new formulation bispyribac sodium 4% SE + metamifop 10% SE at 70 g a.i. ha-1+ wetter at 100 ml ha-l. Similarly, the maximum benefit cost ratio of 2.79 in 2013 and 3.05 in 2014 were realized with the POE application of herbicide combination bispyribac sodium 4% SE + metamifop 10% SE at 70 g a.i. ha-l + wetter at 100 ml ha-l. The results of this study are important for farmers growing DSR in making decisions regarding the application of POE herbicide combination, according to existing weed flora in the field.
Pages: 928-934 | 1407 Views 176 Downloads
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How to cite this article:
R Sathya Priya, C Chinnusamy, P Murali Arthanari, P Janaki. Bio-efficacy of new herbicide combination (Bispyribac sodium 4% SE + Metamifop 10% SE) on weed control, economics and profitability of direct seeded rice. Int J Chem Stud 2017;5(4):928-934.
