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acidic aluminum Al/ext Amer base sat base saturation base unsat Brown Podzolic soils buffered solution CaC03-determined LR CaC03LR CaC03LR-pH(KCl cation exchange capacity cd cd clay coefficients of determination common associates include commonly on gently determination R2 driftless area equilibration exch exchangeable aluminum ext.-exch formed in loess formed primarily forms of aluminum Freeon Gley soils Gray Brown Podzolic hydroxy I I I I I o o o o o imperfectly drained Keeney and Corey light colored lime requirement tests lower story LR tests McLean moderately well drained multiple regression Normudalfs Gray Brown northcentral Wisconsin occur most commonly organic matter outwash plains partial correlation coefficients pH(KCl Proc Simple and partial Simple correlation coefficients SMP-LR soil groups soil pH Soil Sci soils are silty soils occur southwestern Wisconsin standard partial regression story is formed subsoils surface soils titration Typic Normudalfs Gray upper story variables various soil properties Wood.-LR