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Roger..... ...your NAA can easily handle an 8' disc. Don't get a 4' disc, unless you want to spend all day tractoring. Plowing turns under all vegitative material to decompose and add hummis to the soil for tilth and fertility. It gets rid of weeds and old crop residue. It also exposes the soil to both water and wind errosion. Pasture grass roots stop soil errosion. Unless you're planning on pure crop hay for baleing for sale (and 8 acres ain't money making hay cropland) then the turning under of current pasturage to kill isn't recommended. Howsomevers.....you do need to expose some soil so yer pasture grass seed has an opportunity to germinate. It only has to be planted less than 1/4" deep. Mother nature doesn't till soil, she just scatters with the wind, its not very efficent. Us humans want every seed to grow, so we till and plant. If'n I was trying to improve pasture land, besides the necessary considerations of soil fertility and liming (get yer soil tested) and seed variety. I'd probably disc lightly enuff to cut sod (but not turn over) to expose the mineral soil so I could scatter pasture seed and then roll/drag to lightly make soil contact. Then pray for rain..... ....Dell
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