• Pre emergence application of Pretilachlor @ 750 g/ha at 3 DAT followed by post emergence application of Chlorimuron methyl + Metsulfuron methyl @ 4 g/ha on 25 DAT had higher weed contol efficiency and net return.
• Pre emergence application of Butachlor @ 1.0 kg ai/ha on 3 DAT + Finger type single row or double row rotary weeders weeding on 45 DAT. If pre emergence application is avoided, then finger type single row/double row rotary weeders weeding on 20 and 40 DAT.
• Use of rotary weeder from 15 DAT at 10 days interval. It saves labour for weeding, aerates the soil and root zone, prolongs the root activity, and improves the grain filling though efficient translocation and ultimately the grain yield.
• Cultural practices like dual cropping of rice-azolla, and rice-green manure (described in wet seeded rice section 2.5 & 2.6 of this chapter) reduces the weed infestation to a greater extent.
• Summer ploughing and cultivation of irrigated dry crops during post-rainy periods reduces the weed infestation.

Pre-emergence herbicides

• If pre-emergence herbicide application is not done, hand weeding has to be one on 15th DAT.
• 2,4-D sodium salt (Fernoxone 80% WP) 1.25 kg/ha dissolved in 625 litres with a high volume sprayer, three weeks after transplanting or when the weeds are in 3 - 4 leaf stage.
• Early post emergence application of Bispyripac sodium 40 g ha-1 (2-3 leaf stage of weeds) + Hand weeding on 45 DAT.
• Use Butachlor 1.25kg/ha or Anilophos 0.4kg/ha as pre-emergence application. Alternatively, pre-emergence application of herbicide mixture viz., Butachlor 0.6kg + 2,4 DEE 0.75kg/ha,  or Anilophos + 2, 4 DEE ‘ready-mix’ at 0.4kg/ha followed by one hand weeding on 30 - 35 DAT will have a broad spectrum of weed control.
• Any herbicide has to be mixed with 50kg of dry sand on the day of application (3 - 4 DAT) and applied uniformly to the field with thin film water on the 3rd DAT. Water should not be drained for next 2 days from the field (or) fresh irrigation should not be given.
• Pre- emergence application of pretilachor at 1.0 kg a.i. ha-¹ on 3 DAT + weeding with Twin row rotary weeder at 40 DAT.
• PE Pyrazosulfuron ethyl 10 % WP @ 150 g ha-¹ on 3 DAT + hand weeding (HW) on 45 DAT.
• PE butachlor 0.75 kg a.i. ha-¹ + bensulfuron methyl 50 g ha-¹ on 3 DAT + HW on 45 DAT.
• PE Oxadiazon 87.5 g a.i. ha-¹  followed by Post emergence (POE) 2,4-D 1 kg a.i. ha-¹ along with hand weeding on 35 DAT.
• PE butachlor 0.75 kg per hectare + bensulfuron methyl 50 g ha-¹ on 3 DAT followed by mechanical weeding on 45 DAT is effective for broad spectrum weed control.
• Crop growth and yield were enhanced by butachlor 1.2 + 2,4-DEE 1.5 lit ha-¹ with 100% inorganic nitrogen.
• Conventional tillage of one dry ploughing and two passes of cage wheel puddling combined with pre-emergence application of butachlor at 1.25 kg ha-¹ under lowland situation.
• Stale bed preparation by pre-puddling minimum tillage with glyphosate combine with post-plant pre emergence butachlor 1.25 kg ha-¹ resulted in increased rice grain yield, net income and B: C ratio in rice-rice cropping.

Herbicide mixed with 50kg of dry sand

Post - emergence herbicides