Received for publication February 20, 1979. Tech Paper No. 4757 of the Oregon Agricultural Experiment Station, Corvallis, OR.
Professor of Agronomy.
Soil Scientists.
Appreciation is given to F. Ball, Kohler Betts, W. DeWitt (deceased), L. G. Ekin, T. R. Horning, M. M. Oveson, C. R. Rohde, and H. M. Waddoups who also collected data analyzed in this study.
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