http://www.indg.in/agriculture/agricultural-best-practices/organic-production/red-gram

Weed management

Weed management is required only up to 60 days of crop growth, as this is the time when weeds compete with the crop for nutrients. First weeding (hoeing) is to be done at 20-25 days, while second hoeing is done at 50-60 days after sowing. Although some organic farmers are of the opinion that second hoeing damages root system and need to be avoided. Do not throw or burn the uprooted or cut weeds. Leave them there in the field as mulch. Normally no weeding is required after 60 days of crop growth, but in case if it is needed then manual weeding should be done only in alternate rows.