The mixing ratio for Farm General 75271 Glyphosate Grass and Weed Killer depends on its concentration. If it's a 41% glyphosate solution, the general recommendation is 2 to 4 ounces per gallon of water for standard weed control. For 53.8% glyphosate, the mix ratio is typically 1.5 to 3 ounces per gallon of water