This NebGuide describes how weeds can be controlled in alfalfa. Increased weed density in new seedings of alfalfa can decrease alfalfa stand.
Weeds can also substantially reduce yield and quality of established alfalfa.
As weed content increases, the percentage of alfalfa in forage declines. Normally the quality of forage declines as the percentage of weeds increases. Effect of weed interference on established alfalfa yield. Successful weed control involves effective cultural practices and may involve using a herbicide. Also check the label of previously used herbicides to make sure they will not carryover and damage seedling alfalfa.