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p~+lll 350 SOIL FOR MA71ON, CLASSIFICATION, AND SURVEY Clt. IZ ~~ permeability, (d) shallow depth and restricted root zone, (e) low water- holding capacity; (C) low fertility, (g) moderate alkali or sahnit ,and (h) .I unstable soil structure. t i. Soils in class III often require_speciaLcotLServatiorLpzaciices. Those ' mentioned for class II land must be employed, frequently in combination with ~ i restrictions in kinds of crops. Tile or other drainage systems may also be ~ I needed. +~ d Cuss Iv. Soils in this class can be used for cultivation, but there are very .~~' r _ severe limitations on the choice of crops. Also, ver)• careful..management - .~ may be required. Tht; alternative uses of these soils are more limited than j ~; 1 for class III. Close-growing crops musLbe.used extensively, and row crops ; cannot be grown safely in most cases. The choice of crops may be limited i f I by excess moisture as well as by erosion hazards. ~ The most limiting factors on these soils may be one or more of the Follow- - . , ing: (a) steep slopes, (b) severe erosion susceptibility, (c) severe past erosion, (d) sha oli-ems-(-low water=holding capac_uy, (fj-poor drainage, and - ' ~ (g) severe alkalinity or salinity. Soil conservation practices must be applied more frequently than on soils in class III. Also, they are usually combined with severe limitations in choice of crop. 1 't =. t 1. ~, V CLASS v. Soils in classes to VIII are generally not suited-to cultivation. ? _ _ Those in class V are lim_ iced in_ their safe use by factors- other than erosion hazards. Examples of such limitations follow: (a) subject to frequent stream overflow, (b) erowing season too short for crop plants, (c) stony or ` t. rocky soils, and (d) ponded areas where drainaee is not Feasible. (~i[entimes, ~i ~ ~' pastures can be improved on this class of land. , CLASS vl. Soils in this class have extreme limitations that restrict their _ ti use largely to pasture or range, woodland, or wildlife.~'he limitauons are p ;; the same as those for class IV land, but they are more rigid. _ ,) C1AS5 vn. Soils in class VII have v_et'~sev_ete_limitations which restrict - V their use to grazing, woodland. or wildlife. The physical limitations are the i. ` same as VI except they are so strict that pasture improvement is impractical. crAL VIII. In this land class aze soils that shoul _d not-be LSed~fos_.arty __ kind of commercial plant production. 7hetr use is restricted-to-_recieation, -- (' wildlife, water supp~•, or_aes[hetic purposes." Examples of kinds of soils =- I orland forms included in class VIII are sandy beaches, river mash, and rock - , (` outcrop. _ See. 1~:12 LAND CA four kinds of IimitaSiol (e); µ•emess, drainage climatic limitations (c). that it is In class III bee Land capab INOnietleral rur. pretlominantly suitable for . More than 67 percent ® 50.66 percent suitable Predominantly unsuitable f< (~ More than 67 percem i [~ 50.66 percent unsuitat w 3sc ~ 30C ~ 250 C 200 z t60 ° too J '' 60 a7 I suseLASS6. In each of the land capabilityclasses are subclasses which P'cuRe 12[8. Geographic, ,:- of land capability classes in u have the same-kind. of.dommant limitations Cor aericultural us-es.~i he _ (lp))