I hear a lot of folks complain about Crabgrass even though they've upped the active ingredient on their granular to .15% & beyond. Small wonder when half the turf is feeling the .15 & half feels almost nothing. Back in the early '90's, Rohm & Haas mandated a specific number of "prills per square foot" which prevented formulators from using the popular SGN240 raw materials to make combination products unless the material was being spread at greater than 250 lbs per acre. Hence the .01% was often made with SGN 150-180 rwas for a while. Dow then lowered the bar & now all manner of ag-type raws are used to formulate Dimension combos. Control for many has suffered as one would expect. Does anyone still have any of that old R&H paper hanging around? I threw it out during an office remodel & can't find it on the www anywhere. Weedman did similar tests using Pendimethalin but as far as I know their data wasn't published...or was it? Any old Scott's players have it maybe? Other terms - Prills per square inch, prills per square foot, partical density, etc.