For small millet cultivation in tribal and rainfed areas of India, suitable Integrated Weed Management (IWM) approaches include:

• Pre-emergence herbicides (e.g., Pendimethalin) for early-season weed control.
• Inter-row mechanical weeding using simple, low-cost tools like cycle weeders.
• Crop rotation and intercropping (e.g., millets with legumes) to suppress weed emergence and diversify weed flora.
• Mulching with crop residues to conserve moisture and suppress weeds.
• Use of improved, competitive cultivars to outgrow weeds.

If you are just asking about approaches, not specific solutions, than the permacultural and agroforestry approaches are always the best strategies when looking at the entire model with all real input and outputs.

But I think that small aerial drones, used early in the season to kill of emerging weeds, have become a better solution than IWM by now. Except you want to combine it with AI and call it an IWM system.