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U.S. DEPARTMENT OF AOkICULT'UkE rove ~ ur ! NATURAL RESOURCES CONSERVATION SERVICE • • II/1!198 PHYSICAL PROPERTIES OF SOILS Endoote -- PEYSICAL PROPERTIES OF SOILS--Continued ORGANIC NATTER is the plant and animal reaidae is the soil at -arioaa etagea of decoopoaitioo. la report J, the eatioated ceoteot of organic utter is erpreaaed as a percentage, by night, of the soil uterial that ie leas thno 1 nillioetera is diueter. the content of organic utter is a soil coo be uietaiaed or increased by retaroiag crop reaidee to the soil. Organic utter affects the uailable rater upuity, infiltration rate, and filth. It is a aoorce of eitrogee and other aatrieata for cropa. EROSION PACTOR [fadicatea the eaeceptibility of the Thole soil liocladieg rocha and inch fragoeatal to sheet and rill eroaioa by refer. Factor [ is one of air factors Deed is the Uoi-eraal Soil Loaa Egoation IUSLEI to predict the a-erage anaaal rate of soil loan by sheet sad till eroaioo io toes per acre per year. The eatioatei are based priurily oo percentage of silt, uad, sad organic setter (up to ! pertestl sad oa soil stractare sad peneability. Yalaea of [ Wage iron O.OS to 0.69. The higher the nlae, the note aaaceptible the soil is to sheet and rill eroaioa by rater. EROSION FACTOR Rf is lice EROSION FACTOR C bot it is for the fine-earth fraction of the soil. Roche sad rock fngoenb ue not cooaidered. EROSION FACTOR T is ao satinets of the oarinon nenge aoooal rite of soil erosion by rind or rater that can ocwr rithoat attacking crop prodocti-ity over a aaataiaed period. The me is in tone per acre per yeu. RIND EROOIEILITY GROUPS ere Dade ap of aoila that here aioilar properties affecting their reaiatance to rind eroaioo is calti-ated arena. The groups indicate the aoateptibility of soil to rind eroaioo. Soils are grooped accordieg to the folloring diatiectiona: J. Caarae aaoda, aaada, fine aaoda, and rery fine aaoda. These voila are generally not aoitable for cropa. They are erirenely erodible, and regetttiao is di[fiwlt to eatabliah. 1. Loaay cosine aaoda, loony aaoda, loony fine aaoda, loony rery fine aaoda, sad aapric soil notarial. These soils ere rery highly erodible. Crops can be grora if iatenai-e ^enaurea to control ^ind eroaioo are used. J. Coerce seody !Dena, aendy loans, fine aendy loans, end rery fine seody loos. These soils are highly erodible. Crops can be groin if intensive oeeaoree to control riod erosion are used. !L. Celcereoua locos, silt !Dena, clay loos, eed silty clay loans. These sails are erodible. Crape coo be grora if intensive reasures to control riod erosioo are used. !. Clays, silty clays, noncalcareoos clay locos, eed silty clay loam that are Dore then ]S percent clay. These soils are ooderately erodible. Crops can be grora if measures to control ^ind erosioo ere used.