I am planning to use some three way on my property for clover, broadleaf, etc and was thinking of buying one of those 25 or 40 gallon pull behind spreaders like they sell at Tractor Supply. The only problem though is I do not know how to determine how much chemical to put per gallon of water. If it needs to be determined by the per 1000 sq. ft. method then does that mean I have to calculate the output of the sprayer or what? Can someone give me some idea of how to mix it so that I am somewhere between the min and max strength?