Received for publication December 12, 1974. Contribution from the Oregon Agricultural Experiment Station in cooperation with the Agricultural Research Service, USDA. OR Agr. Expt. Sta. Techn. Paper No. 3891.
Associate Professor of Agronomy, Columbia Basin Research Center, and Soil Scientists, Columbia Plateau Conservation Research Center, Pendleton, OR. Appreciation is given to Leslie G. Ekin, Agricultural Research Technician, for expert field assistance given in this study.