I'm trying to figure out the different effects Nitrogen has on turf. I'm trying to figure why are there so many different products, and what effects these products produce? I applied 32-5-7 last week and noticed a good green-up, but had to bag the entire yard. If I had used a product that was lower in N2 would would be the resualts? I have herd that so should take a soil sample prior to ferting. If this is the case does every lawn have a differnt program based from the resualts of that soil sample?