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<br />).5. <br /> <br /> <br />00185ti <br /> <br />SCS, 1961), and a tabulation of 139 soil series of this group in Arizona <br /> <br />by the So.ilConservationpElrvice, showed~O percent having slow to <br /> <br />very slow inHltration "without the benefit of vegetative cover". <br /> <br />. <br /> <br />herbaceous cover was about. !iclUble this, and .from'.a- bare area there <br /> <br />was forty times as much ruroff, sho.wing the strik<ing effect of <br /> <br />vegetation on infiltration r.ates. <br /> <br />Changes in: the vegetation brought about by man and his animals <br /> <br />may have marked effects on the runoff. For example, Dunford (1954) <br /> <br />found on small plots that grazing of a bunchgras$- cover increased the <br />