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~ '- ~ - ,.-', c.' ,; Determinative Factors in the Classification Standards for Arable Land Class 1 Land Class 2 Land Soil texture*:Fine sandy loam to friable:Loamy sand to friable clay : clay loam Depth of soil:18 inches good plow soil; :42 inches of soil pene- :trable by roots and water Salinity and :No black alkali. Total alkalinity of:salts not to exceed 0.2 soil : percent :No rock or loose stones :that would interfere with :ordinary cultivation :12 inches good plow soil; :30 inches of soil penetrable :by roots and water :Traces of black alkali not :to exceed pH 9.0. Total salts :not to exceed 0.) percent :No rock in place, Easily re- :movable surface rook limited :to that generally cleared in :similar oommunities where ir- :rigation is practiced. :General gradient 5 percent:General gradient of 5 - 10 :or less with reasonably :percent or less than 5 per- :large-sized areas sloping :cent for uneven slopes. ~by :in same general plane. :require considerable leveling :Surface even enough to re-:and/or heavy grading limited :quire only ~~ll amount of:to amounts generally found :leveling and no heavy :practicable in similar com- : grading :munities where irrigation is :practiced :Early seepage of land un- :Early seepage of land ex- :likely. Artificial drain-:pected. Artificial drain- :age practicable at low :age practicable at reason- :cost :able cost Rock and rocky soil TopographY Drainage *Where depth of plow soil over gravel, coarse sand, or broken rock, approaches the mininv~ of 12 and 18 inches, its texture must be at least that of fine sandy loam. Class 6 Land - Includes all land below the mlnllllUffi standards for Class 2 in either soils, topography, or drainage; also isolated tracts of arable lands; and small scattered traots apparently impracticable of irri- gation. . 9 :'1