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Tillage and Nitrogen Fertilizer Influence on Carbon and Soluble Silica Relations in a Pacific Northwest Mollisol

H. T. Gollany^a,*, R. R. Allmaras^b,, S. M. Copeland^b, S. L. Albrecht^a and C. L. Douglas, Jr.^a,

^a USDA-ARS, Columbia Plateau Conservation Research Center, P.O. Box. 370, Pendleton, OR 97801
^b USDA-ARS, Dep. of Soil, Water, and Climate, Univ. of Minnesota, St. Paul, MN 55108

View larger version (26K): [in a new window]   Fig. 1. Profiles of (a) soil bulk density (b), (b) coarse organic matter (COM), and (c) soil pH with depth, as related to primary tillage and N fertilizer rate (the Sx has 12 and 13 d.f. in Ap and B horizons, respectively).

View larger version (29K): [in a new window]   Fig. 2. Profiles of (a) fine organic matter (FOM), (b) water-soluble carbon (Cws), and (c) water-soluble silica (Siws), as related to primary tillage and N fertilizer rate (the Sx has 12 and 13 d.f. in Ap and B horizons, respectively).