Panoramic 2SL is an effective pre-emergent and post-emergent herbicide designed to prevent or control perennial broadleaf weeds and various grasses from growing on non-cropland and pastures.
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At $150 a gallon, you would get 21 acres at 6 ounces an acre and 32 acres at 4 ounces an acre. That’s about as cheap as you will find.
Only comes in 50lb bags. But will last several years. I plant about 2-3lbs in mix and 5lbs/acre in dove field. I also use as companion crop with NWSG plantings using imazapic.