Technical Bulletins
ABOUT THE COLLECTION
The Arizona Agricultural Experiment Station is the research arm of the College of Agriculture and Life Sciences at the University of Arizona. Research is conducted in the various departments and schools on campus, as well as at Agricultural Centers throughout the state. Research generated through the Arizona Agricultural Experiment Station underlies both academic and extension programs.
The repository collection includes historical Annual Reports, Bulletins, Reports, Technical Bulletins, and Timely Hints for Farmers. Visit the Agricultural Experiment Station website for current research reports.
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Contact College of Agriculture and Life Sciences Publications at pubs@cals.arizona.edu.
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.