Productivity, Weed Control and Economics of Transplanted
Rice as Influenced by New Post Emergence Herbicide
Bispyribac sodium
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Author:R. Veeraputhiran and R. Balasubramanian
p-ISSN:0024-9602, e-ISSN:2582-5321, Vol:101, Issue:oct-dec
DOI: https://doi.org/10.29321/MAJ.10.001212
Abstract
Field experiments were conducted at Agricultural College and Research Institute, Tamil Nadu
Agricultural University, Madurai, to evaluate the new herbicide Bispyribac sodium in
transplanted rice on yield and weed control efficiency in transplanted rice varieties ASD 16
and ADT 37 during Kharif 2011 and 2012, respectively. Seven treatments were included in a
Randomized Block Design and replicated four times. The treatments consisted of pre–
emergence application of Butachlor @1500 g a.i. ha -1 , post emergence application of Bispyribac
-sodium 10 SC at 25, 35 and 50 g a.i. ha -1 , weed free, hand weeding twice and unweeded
check. The results revealed that the total weed population and dry weight under Bispyribac
sodium at 25 g a.i. ha-1 were on par with the higher doses of Bispyribac sodium at 35 and 50
g a.i.ha -1 during both the years of study. The weed control efficiency and weed index under
Bispyribac sodium at lower dose were also comparable with that of higher doses indicating
the sufficiency of Bispyribac sodium at 25 g a.i.ha -1 for effective weed management in
transplanted rice. The effect of Bispyribac sodium at 25 g a.i. ha -1 on producing tillers and
panicles was also on par with that of higher doses and twice that of hand weeding and found
to be significantly superior to Butachlor application. Post emergence application of Bispyribac
sodium at 25 g a.i. ha -1 recorded a grain yield of 6838 and 6510 kg ha -1 during 2011 and 2012,
respectively, which were found to be on par with higher doses of Bispyribac sodium, twice
hand weeding and weed free; and significantly higher than Butachlor application. Higher
economic benefits like net income and benefit-cost ratio were also associated with the
application of Bispyribac sodium at 25 g a.i. ha -1 than all the other weed managemnet
treatments
Key words : Rice, Bisbyribac sodium, Weed, Grain yield and economics