i don't own an aerater, but plan on applying fert. to a few yards. my question is, how many of you fertilize w/o aerating? would it be worth it for me to rent one and take a loss? or should i just spread the fert.? another, how do you charge for fertilization? i live in the NE, anyone with suggestions on what the best all-around fert. for the money is? thanks for your help, i'm trying to sort some things out..