it is dirty in some spots from wind erosion. The first pic is next to a field of ours that we ran a shallow disc over in fall to size and anchor residue. Not much dirty snow. The next is just across the gravel road, note the tan lime dust blown on top. The third is a neighbors field that had the corn ground chiselled and bean ground harrowed. That is a bit more messy, especially the material coming off the bean ground. It will look even worse in a few days as the forecast is temps to hover around freezing. Topography may have played some part but it is not the driving factor in these images. This and over $4/gallon diesel fuel sure make no till look a bit more attractive.
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