Dr. Rajendra Prasad Central Agricultural University
Pusa, Samastipur – 848 125, Bihar, India

" AN INSTITUTION OF NATIONAL IMPORTANCE, GOVERNMENT OF INDIA "

Weed Management

Technology Developed for Management of Weeds in different Crops/ Cropping Systems

Pre-emergence application of Butachlor 1.5 kg/ha or Anilophos 0.3-0.4 kg/ha or Pretilachlor 0.75 kg/ha and post emergence application of Pyrazosulfuron 25 g / ha or Bispyribac Sodium 25 g /ha at 20-25 DAS has been recommended for weed management in direct seeded rice.
Pre-emergence application of Butachlor 1.5 kg/ha or Thiobencarb 1.5 kg/ha or Anilophos 0.4 kg/ha within 3 days of transplanting and post emergence application of 2,4–D 0.5 kg/ha or Pyrazosulfuron 30 g/ha or Bispyribac Sodium 25 g /ha at 20-25 DAT has been recommended for weed management in transplanted rice.
The system productivity was recorded to be maximum under rice (direct seeded) -potato cropping system. While profitability was the highest under Rice (DSR)-Berseem followed by Rice (DSR)-Potato. Among the weed control treatments recommended herbicide (Pre-emergence application of Butachlor 1.5 kg/ha for DSR, Metribuzin 0.5 kg/ha for potato and Pendimethalin 1.0 kg/ha for Berseem) proved its superiority over others.
  • For weed management in wheat, post emergence application of 2,4 –D 0.8 kg/ha or Carfentrazone 25 g/ha at 30 DAS (where Phalaris minor is not a problem)  or Isoproturon 0.75-1.0 kg/ha or Sulfosulfuron 25 g/ha as POE when Phalaris minor and wild oat are also problematic and Pre-emergence application of Pendimethalin 1.0 kg/ha are recommended.
  • Application of Clodinafop + Metribuzin 60+122.5 g/ha at 28 DAS or Sulfosulfuron + Metribuzin 25+150 g/ha at 28 DAS were found equally effective for reducing the weed count and weed dry weight and producing similar grain yield to that of weed free plot.
  • Application of Pinoxaden + Carfentrazon ethyl 50 + 20 g/ha at 28 DAS has also been found equally effective for reducing the weed count and weed dry weight and producing similar grain yield to that of weed free plot.

Rice-wheat cropping system
The lowest weed count and weed dry weight and the highest grain yield and monetary returns were achieved under conventional tillage in rice – zero tillage in wheat. Among weed control treatments, recommended herbicides (pre-emergence application of Butachlor 1.5 kg/ha for rice and Isoproturon 1.0 kg/ha for wheat) had proved its superiority over others in terms of getting maximum productivity and profitability.

Pre-emergence application and soil incorporation of Fluchloralin 1.0 kg/ha or pre-emergence application of Alachlor 1.0 kg/ha or post emergence application of Quizolofob ethyl 40 g / ha at 15-20 DAS are recommended for effective weed control in mustard.
For effective weed control in chickpea, pre- emergence application of Pendimethalin 1 kg/ha or post emergence application of Quizolofob ethyl 40 g / ha at 15-20 DAS or Fluchloralin 1.0 kg/ha as pre-emergence and its soil incorporation are recommended.
Atrazine 1.5 kg/ha as pre-emergence + 2,4–D 0.8 kg/ha as post-emergence or Pendimethalin 1.0 kg/ha as pre-emergence followed by 2,4 –D 0.8 kg/ha as post-emergence are recommended for effective weed management in maize (kharif and rabi).
Application of Fluchloralin 1.0 kg/ha as pre-emergence and its soil incorporation or Oxadiazon 0.5 kg/ha is effective for controlling weeds in lentil.
Application of Fluchloralin 1.0 kg/ha as pre-emergence and its soil incorporation or Oxadiazon 0.5 kg/ha is effective for controlling weeds in lentil. Maize-Potato inter-cropping The pre-emergence application of 0.5 kg/ha metribuzine followed by one earthing up at 25 DAP has been found the most effective and remunerative for controlling weeds in the field of maize + potato intercropping system and for higher productivity and net return of the system.

Pre-emergence application of Metribuzine @ 1.0 kg/ha + post emergence applications 2,4-D @ 1.0 kg/ha at 60 days after planting followed by hand weeding at 90 days after planting effectively controls the weed flora in sugarcane.

Sugarcane Ratoon

Pre-emergence application of Metribuzin 0.88 kg/ha fb one hoeing at 45 DAP fb 2,4-D (Na salt ) 2.5 kg/ha at 90 days after planting.

Mechanical weeding twice in both the crops or application of Butachlor 1.5 kg/ha + 1 HW in rice and Pendimethalin 0.75 kg/ha + One hand weeding in chickpea minimized weeds and gave highest grain yield & net return.

Mechanical weeding twice or application of Atrazine 0.75 kg/ha fb 2-4, D sodium salt 0.5 kg/ha in maize crop minimizes weeds and returns highest grain yield.

Mechanical weeding twice or application of Pendimethalin 0.75 kg/ha fb one manual weeding at 40-45 days after sowing in lentil crop, minimized weeds and gave highest grain yield & net return.

Pre-emergence application of Pendimethalin 1.0 kg/ha or post emergence application of Quizalafop 60 g/ha or Hoeing (twice) by cycle hoe (35 & 55 DAS) are recommended for effective control of weeds in Rajmash.
Pre-emergence application of Pendimethalin 1.0 kg/ha under bed planting system effectively controlled weed and gave highest grain yield & net return.
Solarization should be done to control Orobanche weed sps. in tobacco. Solarizaiion of the field before planting of tobacco delays the germination of Orobanche by about 5 days over non solarized condition. Chemicals like, Oxyfluorfen 0.1 kg/ha (3 DAP), Pendimethalin 1.0 kg/ha (3 DAP) and Metribuzine 0.5 kg/ha are also effective for delaying the germination of Orobanche sps. by 3 days under both solarized and non solarized condition.
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