EFFICACY OF DIFFERENT HERBICIDES IN TRANSPLANTED RICE [Oryza sativa (L.)] IN SCARCE RAINFALL ZONE OF ANDHRA PRADESH
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Date
2018
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Acharya N.G. Ranga Agricultural University
Abstract
A field experiment was conducted to study the “Efficacy of different herbicides in transplanted rice [Oryza sativa (L.)] in Scarce Rainfall Zone of Andhra Pradesh” during kharif, 2017 on sandy loam soils at College Farm, Agricultural College, Mahanandi, Acharya N.G. Ranga Agricultural University.
The present investigation comprised eight treatments viz., control (unweeded) (T1), two hand weedings at 20 and 40 DAT (T2), triafamone 20 % + ethoxysulfuron 10 % WP @ 225 g ha-1 at 15-20 DAT (T3), triafamone 20 % + ethoxysulfuron 10 % WP @ 225 g ha-1 at 15-20 DAT + hand weeding at 40 DAT (T4), chloromuron-ethyl 10 % + metsulfuron-methyl 10 % WP @ 20 g ha-1 at 15-20 DAT (T5), chloromuron-ethyl 10 % + metsulfuron-methyl 10 % WP @ 20 g ha-1 at 15-20 DAT + hand weeding at 40 DAT (T6), bispyribac sodium 10 % SC @ 200 ml ha-1 at 15-20 DAT (T7), bispyribac sodium 10 % SC @ 200 ml ha-1 at 15-20 DAT + hand weeding at 40 DAT (T8) and laid out in a randomized block design with three replications.
Data on weed species observed in the experimental field revealed that weed species belonged to eight taxonomic families, of which seven species were grasses, four species were sedges and seven species were broad leaved weeds.
Data on weed dynamics viz., Weed density , Weed dry weight , Weed control efficiency and weed index revealed that significantly lesser density and dry weight of weeds with higher weed control efficiency was with two hand weeding at 20 and 40 DAT, however, which was comparable with post-emergence application of bispyribac sodium followed by hand weeding at 40 DAT (T8). The highest values of all the weed dynamics except weed control efficiency were recorded with unweeded check.
Data on growth parameters viz., plant height, dry matter accumulation, number of hill-1 resulted in significantly higher with two hand weedings at 20 and 40 DAT and were comparable with post-emergence application of bispyribac sodium followed by hand weeding at 40 DAT (T8).
The higher yield attributes viz., number of productive tillers hill-1, total number of grains panicle-1, test weight, grain and straw yields were recorded with two hand weeding at 20 and 40 DAT, which were comparable with post-emergence application of bispyribac sodium followed by hand weeding at 40 DAT (T8).
Gross and net returns were significantly higher with two hand weeding at 20 and 40 DAT, which were comparable with post-emergence application of bispyribac sodium fb hand weeding at 40 DAT (T8), the highest benefit-cost ratio was also registered with the same treatment i.e. post-emergence application of bispyribac sodium fb hand weeding at 40 DAT (T8).
In conclusion, the present study was revealed that two hand weeding at 20 and 40 DAT resulted in the highest growth, yield and higher economic returns, which were comparable with post-emergence application of bispyribac sodium fb hand weeding at 40 DAT (T8), indicating the fact that, wherever labour availability for hand weedings is abundant, timely and cheaper, one can go for hand weeding; or else, opt for the said herbicide recommendation, taking into the economical considerations.
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D5571
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