to you and all the rest for some good info. I am kind of like you as far as my fields go.I farm all river bottoms and many of these fields I have been on since I was a boy so I know the soils well. My main problem with a flat rate population is  that any one field can range from gumbo to silt loam,to sand and back again in one pass across the field. I suppose the easiest way to mange this would be for one flat rate, in many of my fields and then just tweak the populations in the sandy areas,and the highest yielding silt loams.

John or others is there any particular seed controller you prefer? I see Veris makes one,did not know that until a friend mentioned it to me. They claim to use pulse rate modulation which is suppose to be the smoothest running?

More questions later as I get some more education,thanks a bunch fellows.