ABSTRACT:
A System for extending conservation tillage research and management practices in the Pacific Northwest has been developed using climatic, soil, and biological parameters to delineate agronomic zones. These zones provide an easily developed, logical foundation for transferring and interrelating management and research information among separate but similar farming areas. Parameters for zone delineation are annual precipitation, growing degee days from January 1 to May 31, and soil depth. Different categories of each parameter combine to best resolve the different zones that exist in north central Oregon. Management practices and problems within each zone are sufficiently common that soil conservationists could adjust technical guides and erosion control systems specific to each individual agronomic zone. Crop or erosion simulation models should be applicable within zone boundaries.
Footnotes
C. L. Douglas, Jr. and R. W. Rickman are soil scientists, J. F. Zexel is a hydrologist, and B. L. Klepper is a research leader with the Agricultural Research Service, Pacific West Area, U.S. Department of Agriculture. P. O. Box 370, Pendleton, Oregon 97801. The article is a joint contribution from ARS and the Oregon State University Agricultural Experiment Station, Technical Paper No. 7972.
- Copyright 1988 by the Soil and Water Conservation Society
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