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<br />To reiterate: <br /> <br />W <br />'i1 <br /> <br />t' ..... <br /> <br />o <br /> <br />*"' <br /> <br />On areas where ground cover of perennial plants is sufficient to support <br />grazing animals, grazing should normally occur when soils are frozen (26). <br />This use should allow sufficient rest from grazing at a time when the <br />freeze-thaw cycle will improve soil tilth through frost-heaving. The <br />grazing period reported on by Lusby (26), which encompasses the season <br />when soils would be most likely to freeze, is November 15 through <br />February 15. Figure 1 illustrates the effect of sheep grazing upon a <br />loose, friable soil during the critical spring period when soils are <br />moist and unfrozen (through March 31). Forage utilization should not <br />exceed 50 percent. on grazed pastures (11). If forage utilization is <br /> <br />8 <br /> <br />.i:" <br /> <br />~j.; <br /> <br />." <br /> <br />, <br /> <br />J <br /> <br />"~ <br /> <br />,~ <br />J <br />" <br />'I <br /> <br />" <br /> <br />.; <br />.." <br />.i <br />.', <br /> <br />", -'; <br /> <br />~i <br /> <br />""-';';'. ~,~,;"__:_" ^.~..Jw:,'-i.,-~~,,~,'~. <br />