EVALUATION OF SULFOSULFURON AS PRE AND POST EMERGENCE HERBICIDE IN WHEAT UNDER IRRIGATED BLACK SOIL
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Date
2001-08-02
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
A field experiment was conducted to evaluate sulfosulfuron as pre and post
emergence herbicide in wheat under irrigated black soil at All India Coordinated Wheat
Improvement Project, Main Research Station, University of Agricultural Sciences,
Dharwad during rabi 1999-2000. The experiment was laidout by adopting randomi2ed
complete block design with 18 treatments and 3 replications.
The predominant weeds observed in experimental site include, Commelina
benghalensis, Cynodon dactylon, Cyperus rottmdns, Dine bra retroflexa and Echinocloa
colonum among the monocots and among dicots, Alternanthera sessilis, Amaranthus sp.,
Bidens pilosa, Lactnca rnncinata, Lagasca mollis, Parthenium hysterophorus,
Phyllanthus nruri and Portulaca oleracea.
Sulfosulfuron @ 50 g ha-1 irrespective of its application timings, recorded
significantly lower population and dry matter of both grassy and broad leaved weeds.
However sulfosulfuron @ 50 g ha-1 applied as pre emergence herbicide recorded lowest
weed population and dry weight and was on par with other pre emergence treatments.
Highest weed control efficiency was noticed with the application of sulfosulfuron @ 50
g ha-1 applied as pre emergence at all the stages of crop growth as compared to 2,4-D Na
salt @ 2500 g ha-1 applied at 30 DAS. Among post emergence treatments, sulfosulfuron
@ 50 g ha-1 applied at 20 and 30 DAS and sulfosulfuron and 2,4-D EE @ 20 and 450 g
ha-1 applied as pre emergence and at 30 DAS recorded higher weed control efficiency at
all the crop growth stages.
Sulfosulfuron @ 50 g ha-1 applied as pre emergence herbicide recorded maximum
grain yield. The increase in yield due to application of sulfosulfuron @ 50 g ha-1 as pre
emergence and at 20 DAS was to an extent of 23.88 and 18.00 per cent respectively over
unweeded control.
Sulfosulfuron @ 15 to 25 g ha-1 applied as pre emergence herbicide was found
most effective in control of both monocot and diocot weeds and recorded higher grain
yields vis-a-vis higher benefit : cost ratio. Sulfosulfuron did not exhibit any phytotoxic
effect on crop growth upto 50 g ha-1 either as pre or post emergence application.
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