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In subhumid and semiarid areas , soils in Class IV may <br /> • produce good yields of adapted cultivated crops during years <br /> of above average rainfall; low yields during years of average <br /> rainfall; and failures during years of below average rain- <br /> fall . During the low rainfall years the soil must be protected <br /> even though there can be little or no expectancy of a marketable <br /> crop . ' Special treatments and practices to prevent soil <br /> blowing , conserve moisture, and maintain soil productivity <br /> are required . Sometimes crops must be planted or emergency <br /> tillage used for the primary purpose of maintaining the soil <br /> during years of low rainfall . These treatments must be <br /> applied more frequently or more intensively than on soils in <br /> Class III . <br /> • LAND LIMITED IN USE - GENERALLY NOT SUITED TO CULTIVATION . <br /> Class V - Soils in Class V have little or no erosion hazard <br /> but have other limitations impractical to remove <br /> that limit their use largely to pasture, range, <br /> woodland, or wildlife food and cover . <br /> Soils in Class V have limitations that restrict the <br /> kind of plants that can be grown and that prevent normal <br /> tillage of cultivated crops . They are nearly level but some <br /> are wet, are frequently overflowed by streams , are stony, <br /> have climatic limitations , or have some combination of these <br /> limitations . Examples of Class V are (1) soils of the <br /> bottom lands subject to frequent overflow that prevents the <br /> normal production of cultivated crops, (2) nearly level <br /> . soils with a growing season that prevents the normal production <br /> of cultivated crops, (3) level or nearly level stony or <br /> 41 -6- <br />