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Furrow Infiltration Rates as Affected by Incorporation of Straw or Furrow Cultivation¹

ABSTRACT

Either straw incorporation or cultivation of the furrow bottom greatly increased furrow infiltration into a sandy loam soil during a 3-year study period. Straw incorporation became less effective as the season progressed. A single straw application of 13.4 tons/ha lasted until midway into the second irrigation season. The cultivation treatment caused serious erosion when furrow inflow rates were about 6 liters/min or more. The straw prevented erosion at all inflow rates (up to 8 liters/min). Organic matter contents were significantly increased by the incorporation of straw. Aggregate stabilities followed the same trend, but differences were not statistically significant.

¹ Contribution from the Soil & Water Conserv. Res. Div., ARS, USDA, in cooperation with the College of Agri., Washington State Univ., Pullman. Scientific Paper no. 3501.

² Research Soil Scientist and Soil Scientist, USDA, Prosser, Wash.

Received for publication September 30, 1970. Accepted for publication December 29, 1970.