ACHETER EN LIGNE: https://t.co/b27ZkRCSLk ===================== A combination of tillage and chemical weed control is usually most effective in grain sorghum. Effective chemical weed control is dependent upon proper weed identification and matching herbicide rate and timing to the particular weeds. Cool-season weeds should be destroyed prior to planting to ensure that crop seedlings emerge competition free. Effective weed control programs start with clean fields at planting. It is critical to remove existing cool season weeds with cultivation or herbicides prior to planting.