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Performance of Tillage Implements in a Stubble Mulch System. I. Residue Conservation¹

Synopsis: During initial tillage of winter wheat stubble, the amount of crop residue retained on the soil surface by a given implement varied with height of stubble, amount of pretillage residue, and spacing between stubble rows. During subsequent tillage, the amount of residue retained on the surface was very slightly affected by height or length of residue, moderately affected by amount of pretillage residue, but strongly influenced by previous method of tillage.

² Agricultural Engineer, Research Investigations Leader (deceased), and Soil Scientist, respectively, USDA, Manhattan, Kansas.

³ Extension Agronomist, Box Butte Experiment Station, University of Nebraska, Lincoln, Nebraska. Grateful acknowledgement is made to D. W. Fryrear and Leon Lyles, Agricultural Engineers, USDA; to D. V. Armbrust, Soil Scientist, USDA; and to Paul Ehlers, Superintendent of the Box Butte Experiment Station, University of Nebraska, for their assistance and cooperation in conducting these experiments.

Received for publication May 28, 1964.