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Chemical weed control in wheat

Chemical Weed Control in Wheat Crop

 Chemical weed control of wheat can be done in the following manner:

1. Broad leaf weeds control:

  • 2-4,D (or MCPA) @ 0.5-1.0 Kg ha-1: It is applied 25-30 days after sowing, after the crop has received its first irrigation at CRI stage. The efficiency of 2,4-D can be synergised by adding urea to the spray tank to a cocentration of 3%. Sometimes it is possible to reduce the dose of 2,4-D when urea is tank mixed with it. If the weed infestation is serious, one mannual weeding can be done.If weeds invade earlierto the crop, 2,4-D can be applied 15 days afetr sowing at the redueced dose of 0.25 kg ha-1.
  • Terbutryn @ 0.75-1.0 kg ha-1.: It is more potent than 2,4-D on broad leaf weeds, including Asphodelus tenuifolius, But costlier than it.
  • Fluroxypur @ 0.2-0.6 kg ha-1:It is a good alternative to 2,4-D for controlling broad leaf weeds in winter cereals. The lower doses are used at 15 days after sowing and higher rates up to 40 days after sowing.
  • Dicamba @ 0.5 kg ha-1or Bentazone @ 0.75-1.50 kg ha-1: These two herbicides are usually employed against more difficult weeds which are not controlled with 2,4-D.

2. Narrow leaf weeds control:

  • Isoproturon @ 0.75-1.25 kg ha-1: It is applied about 25-30 days after sowing. After attaining, first irrigation applied at its CRI stage. On the light soils its doze should be limited to 0.75 kg ha-1, but on heavy soils, if the grass intensity is very high, its dose can be increased up to 1.25 kg ha-1without damage to the crop.It will kill some broad leaf weeds also.
  • Methabenzthiazuron @ 0.75-1.50 kg ha-1 or Metoxuron @ 1.2-1.6 kg ha-1: The two herbicides can be used both for pre and post emergence treatment.
  • Pendimethaline @ 1.0-1.5 kg ha-1:In mustered-wheat inter-cropping croppigh systems, pre-emergent pendimethaline can be used to cotrol grass weeds. But its long persistance behaviour in soil often restricts the choice of rotation crop after wheat.

Methods of application

The commercial product of any chemical should be mixed properly in adequate amount of water. So, the crop field will be covered uniformly. The amount of water should be kept 500-800 litres according to need of particular chemical amount and crop. And spraying should be properly and uniformly for the better results.

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Please note that this is the opinion of the author and is Not Certified by ICAR or any of its authorised agents.