Change in soil microtopography by tillage with a sweep
1993
Hanna, H.M. | Marley, S.J. | Erbach, D.C. | Melvin, S.W.
Information on effects of tillage sweep geometry and operation on soil conditions, including soil surface elevation, is needed for effective design, selection, and use of sweeps for row crop cultivation and ridge construction. The effects of sweep rake angle and of operation speed and depth on changes in soil microtopography were determined. Changes in microtopography due to observed soil aggregate movement were also found A factorial arrangement of pairs of sweeps with three geometries operated at three speeds (5, 7, and 9 km/h) and at two depths (50 and 100 mm) were used to form ridges in afield experiment. Soil shift, or lateral soil movement, and ridge height were affected by both tool operating speed and sweep rake angle. Faster speeds and steeper rake angles created larger ridges. Change in surface height, an indicator of soil loosening, was significantly affected by tool depth and speed, but not by sweep rake angle. Deeper operation created a higher soil surface. The lateral movement of soil into the ridge was more closely related to vertical movement of soil on the tool than to lateral soil movement on the tool.
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