The only time we used it was on a newly cleared/tiled low field. Sprayed it first with RUP,AMS killed everything but the the sedge. Went and spoke with our local Agromist coop guy and followed his directions of spraying then discing,we then planted beans which did well. The sedge never came back, the tile may have helped this also. If I remember correctly it came in premeasured dissolving packets.