As a preliminary experiment I treated soil in containers which had crabgrass growing in them. The crabgrass had been dug up locally, a few days before. Naturally the measuring of the pounds per acre was difficult. I used 23-0-8 with .13 percent dithiopyr as Dimension. One pot was treated with 4 particles, (estimated to be about 4 pounds per thousand sqft of the fertilizer product) and the second had 8 particles (estimated to be about 8 pounds of the fertilizer product per 1000 sqft). The third pot was untreated control. It appears to me that the 8 particle treatment was killing the crabgrass, which was about 1-inch tall. The 4 particle treatment appeared to have no effect.