i have a customer that we have on a fertilizer program, and i put a application out in july (granular) i went back in about a week later and couldnt find but a small trace of fert. (much less than when i had applied it) the yard had been freshly mowed with his new "walker" mower. it hadnt rained so i know it hadnt absorbed that quickly. can or will these mowers pick up fert. off the ground? by the way it looks like he is mowing at 2.5 to 3 inches.