Growing competitive sorghum or mungbean crops can help reduce the growth and seed production of difficult-to-control summer grass weeds like Feathertop Rhodes grass and awnless barnyard grass. A study found that awnless barnyard grass is more affected by crop competition than Feathertop Rhodes grass. To increase sorghum competitiveness, plant the crop closely together in narrow rows and at a higher density. For mungbeans, narrow row spacing is the most effective way to increase competitiveness. Consider planting competitive summer crops to reduce the reliance on herbicides for controlling summer grass weeds.