Answer: Whenever you expose soil on a hillside for any length of time you risk soil erosion, so you might wish to do this in stages rather than all at once. You may also experience great difficulty in establishing a substitute (especially if the slope is steep or the soil is poor), so you may want to give this some serious thought. To remove the vetch, you could try smothering it over time with layers of newspaper or cardboard covered with a thick layer of mulch, or you could kill it with glyphosate carefully applied according to the label instructions. If you use the glyphosate, be aware that it can take some time for it to be translocated to the roots and also that it is a nonselective herbicide and will affect desirable plants as well as the vetch.
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