The invention provides a pyrazosulfuron-ethyl,
clomazone and
butachlor compound dispersible oil suspension concentrate and a preparation method thereof, relating to the technical field of control of weeds in direct
sowing paddy fields. The pyrazosulfuron-ethyl,
clomazone and
butachlor compound dispersible oil suspension concentrate is prepared from 2 parts of pyrazosulfuron-ethyl, 8 parts of
clomazone, 60 parts of
butachlor, 2 parts of
fatty alcohol-
polyoxyethylene ether, 3 parts of styrylphenol
polyoxyethylene ether, 2 parts of
xanthan gum, 1 part of
sodium benzoate, 2 parts of organic
silicon and 20 parts of
solvent oil by weight. The preparation method is characterized by pumping the raw materials into a preparation kettle, mixing and stirring the raw materials, then carrying out primary milling with a
colloid mill, then finely milling with a sand mill, carrying out sampling analysis, and filtering, metering, packaging and warehousing after samples are qualified. The pyrazosulfuron-ethyl, clomazone and butachlor compound dispersible oil suspension concentrate achieves better control of annual grassy weeds, cyperaceous weeds and part of broadleaf weeds in the direct
sowing paddy fields, and achieves united
synergy of pyrazosulfuron-ethyl, clomazone and butachlor, thus achieving obvious synergistic effects; therefore mixing pyrazosulfuron-ethyl, clomazone and butachlor to control the annual grassy weeds, the cyperaceous weeds and part of the broadleaf weeds in the direct
sowing paddy fields is feasible and is also necessary.