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Infiltration as Influenced by Tillage-Induced Random Roughness and Pore Space¹

ABSTRACT

During simulated rainfall, increases in tillage-induced random roughness and pore space increased water infiltration before runoff started but did not significantly influence infiltration throughout a 5-cm runoff period. Random roughness provided a greater accounting of infiltration variation among tillage treatments to initial runoff than did total pore volume of the tilled layer.

Freshly turnplowed alfalfa-bromegrass sod on Barnes loam and Nicollet sandy clay loam soil provided random roughness and pore space conditions that could accommodate without "failure" the major portion of rainfall energy (as evidenced by EI) expected in west central and southwestern Minnesota during the first 2 months following row crop planting. This is the critical runoff-erosion period in the Corn Belt.

¹ Contribution from the Corn Belt Branch of Soil & Water Conserv. Res. Div., ARS, USDA, in cooperation with the Minnesota Agr. Exp. Sta. as Scientific Journal Series Paper no. 6666.

² Soil Scientists, SWC, ARS, USDA, at the North Central Soil Conservation Research Center, Morris, Minn., and at St. Paul, Minn.

Received for publication November 6, 1968. Accepted for publication January 3, 1969.