RSS 1.0Colleges, Departments, and Organizations
ABOUT THE COLLECTIONS
Several University of Arizona organizations, such as colleges, departments, research and administrative groups, have established collections in the UA Campus Repository to share, archive and preserve unique materials.
These materials range from historical and archival documents, to technical reports, bulletins, community education materials, working papers, and other unique publications.
QUESTIONS?
Please contact the Office of Digital Innovation & Stewardship at repository@u.library.arizona.edu with your questions about items in these collections, or if you are affiliated with the University of Arizona and are interested in establishing a collection in the repository. We look forward to working with you.
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Recent Submissions
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Minimum Energy Tillage SystemsEight years of research in minimum tillage methods included eighteen tests at three locations. Different configurations and depths with a chisel-lister and lister only were compared to conventional tillage with disk, moldboard plow, drag float and lister in a cotton-following- cotton cropping sequence. The effects of tillage methods on soil physical condition determined by soil penetrometer measurements showed no correlation. Sometimes there were significant increases; never were there reductions in yield from chisel-listing. In ii general, there was no advantage to running the chisels deeper than 14 inches beneath the level of the previous year's furrow. Draft-fuel testing showed that preplant tillage by chisel-listing required slightly more than ¼ as much fuel as conventional tillage, and time and labor requirements were proportional to fuel consumption. Because chisel-list tillage leaves the field in a rough and trashy condition, seed placement and covering are difficult, but the extra effort required is compensated through the reduction in fuel energy, time and labor.
