EFFICACY OF HERBICIDES AGAINST DIVERSE WEED FLORA OF WHEAT
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Date
2022
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Journal ISSN
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DRPCAU, PUSA
Abstract
An experimental trial was conducted during rabi season of 2021-22 in wheat at
Research Farm Pusa, RPCAU, Pusa, Samastipur, Bihar to evaluate the efficacy of
different herbicides to control diverse weed flora of wheat. The experiment contained
thirteen treatments, of which eleven treatments were based on sole and tank mixed
application of herbicides at three different stages viz., pre-emergence, early postemergence
and post-emergence and rest two were weed free and weedy check. All the
treatments were outlaid in Randomized Block Design with three replications.
Population of grasses and BLWs found in equal proportion over the cropping
period. The most prevalent grasses recorded in the experimental field were Cyanodon
dactylon and Setaria glauca. Whereas, Chenopodium album, Solanum nigrum,
Polygonum persicaria, Melilotus alba, Melilotus indica, Anagalis arvensis, Physalis
minimum, and Vicia sativa, were observed as the principal broad leaved weeds in the
experimental field.
Pre-emergence application of pyroxasulfone + metsulfuron @ 127.5 + 4 gram
active ingredient per hectare recorded superior growth parameters at 30 DAS and in
early post-emergence application of pyroxasulfone + metsulfuron @ 127.5 + 4 gram
active ingredient per hectare at 60 and 90 DAS and at harvest over the other
herbicidal as well as weedy check treatments. However, pre-emergence applications
of metribuzin at 300 gram active ingredient per hectare and pre-emergence
pendimethalin + metribuzin @ 1250 + 280 gram active ingredient per hectare both
caused plants to exhibit phytotoxic symptoms 5 and 10 days after treatment and
scored 1 on a scale of 1 to 10 for phytotoxicity.
Pre-emergence application of pyroxasulfone + metsulfuron @127.5 + 4 gram
active ingredient per hectare resulted significantly lower density of weeds, weed dry
weight, and maximum WCE at 30 DAS. However, in later stages, early postemergence
application of pyroxasulfone + metsulfuron @ 127.5 + 4 gram active
ingredient per hectare resulted in maximum WCE with lowest values of weed density.
Yield and yield attributing parameters viz. spike length and number of seeds
per spike were recorded significantly maximum in early post-emergence application
of pyroxasulfone + metsulfuron @ 127.5 + 4 gram active ingredient per hectare as
well as in post emergence application of sulfosulfuron + metsulfuron @ 25 + 4 gram
active ingredient per hectare and weed free.
Post-emergence application of sulfosulfuron + metsulfuron @ 25 + 4 gram
active ingredient per hectare was registered the most economical over the other
treatment, as it had been observed maximum gross return, net return and BC ratio.
However, significantly minimum gross return, net return and B:C ratio were recorded
in weedy check.