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APPENDIX III-A-3 <br /> • <br /> U . S . SOIL CONSERVATION SERVICE <br /> SOIL CAPABILITY CLASSES <br /> Land Suited to Cultivation and Other Uses <br /> Class I - Soils in Class I have few limitations that restrict <br /> their use . <br /> Soils in this class are suited to a wide range of <br /> plants and may be used safely for cultivated crops , pasture, <br /> range, woodland, and wildlife . The soils are nearly level <br /> and erosion hazard (wind or water) is low. They are deep , <br /> generally well drained, and easily worked . They hold water <br /> well and are either fairly well supplied with plant nutrients <br /> or highly responsive to inputs of fertilizer . <br /> • The soils in Class I are not subject to damaging over- <br /> flow. They are productive and suited to intensive cropping . <br /> The local climate must be favorable for growing many of the <br /> common field crops . <br /> In irrigated areas , soils may be placed in Class I if <br /> the limitation of the arid climate has been removed by <br /> relatively permanent irrigation works . Such irrigated soils <br /> (or soils , potentially useful under irrigation) are nearly <br /> level , have deep rooting zones , have favorable permeability <br /> and water-holding capacity, and are easily maintained in <br /> good tilth . Some of the soils may require initial conditioning <br /> including leveling to the desired grade, leaching of a <br /> • slight accumulation of soluble salts, or lowering of the <br /> seasonal water table. Where limitations due to salts , water <br /> table, overflow, or erosion are likely to recur , the soils <br /> 36 <br />