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<br />SOIL PORES <br />Abundance of pores by number and size <br />Very fine Fine Medium Coarse <br />Code Class (0.1-0.5 mm) (0.5-2 mm) (2-5 mm) (5-10 mm) <br /> Average number per square decimeter <br />1 Few 425 410 41 41 <br />2 Common 25 to 100 10 to 50 1 to 5 1 to 2.5 <br />3 Many 1200 150 t5 T2.5 <br />Continuity: <br />discontinuous. dis <br />constricted. .cons <br />continuous .coot <br />Frequency (~ of ped <br />faces and/or pores <br />• containing clay films): <br />very few (45$)...... v1 <br />few (5-25$).......:. 1 <br />common (25-50$>..... 2 <br />many (50-90$)....... 3 <br />continuous (t90$)... 4 <br />Thickness: <br />thin ................ n <br />moderately thick.... mk <br />thick ............... k <br />Shape: <br />vesicular. v <br />irregular or <br />interstitial i <br />tubular. t <br />CLAY FILMS <br />Morphology: <br />On faces of peds.... pf <br />Line tubular or <br />interstitial pores.. po <br />Oriented clay occurs <br />as bridges holding <br />mineral grains to- <br />gether .............. br <br />Colloid stains on <br />mineral grains...... co <br />• <br />