1988-04-29_PERMIT FILE - C1981008A (49)

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51 Depth: In inches or centimeters from the top of Al, or surface mi- neral horizon, except for the surface of peat or muck in Bogs and Half Bogs. Zhi.ckriess: Average thickness and range, as B(4-8) . Boundary: Horizon boundaries are described as to distinctness: Abrupt-a; clear-c; gradual-g; diffuse-d; and according to top- ography: Smooth-s; wavy-w; irregular-i; broken-b. An abrupt, irregular boundary is ai. (W or: Soil colors are indicated by using the appropriate 11unsell notation, such as 5YR 5/3. The spaces in the suggested notebook page under color are left open, except for checking whether dry or moist, in order to acconatodate the small space to the need of the descriptions of individual horizons. If the soil mass is one solid color, only one notation is required. If the outsides of aggregates differ significantly from their interiors, both colors are needed. The description of mottled soil horizons needs to include the color of the matrix and the color, or colors, of the principal mottles plus a description of the pattern of mottling. Mottling: A description of the mottling in soil horizons requires a notation of the colors and of the pattern. Colors can be given in terms of the Munsell notation or in their linguistic equivalents, since exact measurement is neither possible nor necessary. The pat- tern may be noted as follows: Abundance; Contrast: few. . . . . . . . . . . .f faint. . . . . . . . . . .f ccirnon. . . . . . . . .c distinct. . . . . . . .d many. . . . . . . . . . .m prominent. . . . . . .p Size: fine. . . . . . . . . . .1 medium. . . . . . . . .2 coarse. . . . . . . . .3 Thus a medium-gray soil horizon mottled with yellow and reddish brown could be noted as: 10YR 5/1, c3d, 10YR 7/6 and 5YR 4/4 (or) loYR 5/1, c3d, yellow and reddish brown.