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are regarded as subject to permanent natural limitations and <br /> are not included in Class I . <br /> Soils that are wet and have slowly permeable subsoils <br /> are not placed in Class I . Some 'Kinds of soil in Class I <br /> may be drained as an improvement measure for increased <br /> production and ease of operation. <br /> Soils in Class I that are used for crops need ordinary <br /> management practices to maintain productivity - both soil <br /> fertility and soil structure. Such practices may include <br /> the use of one or more of the following : Fertilizers and <br /> lime, cover and green-manure crops , conservation of crop <br /> residues and animal manures , and sequences of adapted crops . <br /> • Class II - Soils in Class II have some limitations that <br /> reduce the choice of plants or require moderate <br /> conservation practices . <br /> Soils in Class II require careful soil management , <br /> including conservation practices , to prevent deterioration <br /> or to improve air and water relations when the soils are <br /> cultivated . The limitations are few and the practices are <br /> easy to apply . The soils may be used for cultivated crops , <br /> pasture, range, woodland , or wildlife food and cover . <br /> Limitations of soils in Class II may include singly or <br /> in combination the effects of (1) gentle slopes , ( 2) moderate <br /> susceptibility to wind or water erosion or moderate adverse <br /> effects of past erosion, (3) less than ideal soil depth, (4) <br /> somewhat unfavorable soil structure and workability , (5) <br /> • slight to moderate salinity or sodium easily corrected but <br /> likely to recur , (6) occasional damaging overflow, (7) <br /> 37 -2- <br />