We put about 6 ac. of hard to farm land in the CRP program last year. We opted for the 15 year program. I had three small fields. The guidelines required we plant pines in one field. The other two were our choice and we planted hardwoods, mostly oak. We rent out our farm, and the farmer tilled the fields nice and smooth before the trees were planted. The trees were planted in rows 12 ft wide and spaced 8 ft apart. I mowed them last year with my lawnmower with a 60" deck. This year a bought a JD 1050 and a 72" finish mower to use around the trees. The first year the weeds were terrible! The trees were so small it was like looking for a needle in a haystack. By the fall I had the fields under control. As the trees get larger it will be easier to mow. I won't had to spend so much time looking for them in the weeds. Having the fields smoothed out before hand made a big difference in how easily I could mow. I might suggest you tie some bright colored flagging tape loosely around the trees when they are first panted. I will make them much easier to see later. I think the tree selection is based on the soil type and wetness.