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., AND SURVEY Ch. 12 ~- <br />' OF LAND USE - <br />CULTIVATION <br />_ m ~ <br />- ~ c > u - - <br />E ~ - ` = - <br />~ F > <br />:_ <br />portion shows uses <br />:h classes are suitable ~. <br />lass can be used with safely. _` <br />nd can safely be put as one <br />irh and Sr¢ele (2).] <br />rll drainedyand_th_~land <br />Ive characteristics which __ <br />f Certilizer. <br />eh. In arid and semiarid <br />- -rte-- <br />~istics mentioned above <br />t irrigation system. ~ -~`- <br />anagement practices to •- <br />a of Cenilizer and hme <br />ng green manures. Crop <br />Ste. L2:IZ LAND CAPABILITY CLASSIFICATION 349 <br />p,~mr._...... _.._,. <br />t'-~ <br />FIGURE 12:17. Several land capability classes in San Mateo County, California. <br />A range is shown from [he nearly level land in the foreground (class {), which can be <br />cropped intensively, to [hatof the badlyeroded hillsides (classes Vll and Ylli). Although <br />topography and erosion hazards are emphasized here, it should be remembered that <br />other factors-drainage, stoniness, droughtiness-also limn soil usage and help <br />determine the land capability class. [Phoro courtesy U. S. Consercarion Service.] <br />depth, (d) less than ideal soil structure and workability, (e) slight to moderate <br />alkali or saline conditions. and (~ somewhat restricted drainage. <br />The manageutent practices that may be required for soils In class II <br />include terracing, strip cropping, contotu tillage, rotations involving <br />grasses and legumes, and grassed waterways. In addition, those practices <br />which are used on class 1 land are also generally required for soils in class II. <br />CLgSS III. "Soils in class III have severe limitations that reduce the choice <br />;that reduce the_choitx of pplants or require special conservation practices or both." The same crops <br />s." These soils may ~ can be grown on class III land as on classes I and II. The amount of clean, <br />~e capable of sustaining cultivated land is restricted, however, as is the choice of the patticular <br />propping systems, they crop to be used. Crops which provide soil cover such as grasses and legumes <br />must be more prominent in the rotations used. <br />• or more factors, such Lim¢ations in the use of soils in classJlll result from factors such as <br />:s, jc) inadequate soil. (a) moderately steep slopes, (b) high erosion hazards, (c) very slow water <br />