what's the best way to gauge fert application with a rotary spreader? I've used a small Scotts rotary for years, but I don't use Scotts fert, so the dial # is meaningless for other types of fert. I picked up some Lescos today and will spread tonight. One bag covers 11,000sqft. I know my yard's dimensions and can get a general sense of how far one bag will go, but have no idea on the rotary dial #. Halfway open, 1/4, 1/3???? In the past, I've just winged it and hoped I didn't run out or put too much down for the given area.