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Bulk Density, Aggregate Stability, and Organic Matter Content as Influenced by Two Wheatland Soil Management Practices¹

ABSTRACT

The amount of organic matter in the top 15.0–30.5 cm of a Grant silt loam after 11 years of stubble mulching was significantly greater than that in clean tilled (plow) plots on this soil over the same time period. Aggregation under stubble mulching was greater than with clean tillage. Soil compaction was noted by an increase in bulk density at the 23.0–30.5 cm depth in clean tilled plots, but was absent at all depths measured in stubble mulched plots.

Annual nitrogen applications gave a significant increase in organic matter content at the 15.0–23.0 cm soil depth. Stubble mulching in an alfalfa (Medicago sativa L.)-wheat (Triticum aestivum L.) rotation program was shown to influence the soil physical properties more significantly than did stubble mulching in a continuous-wheat or the clean tillage in an alfalfa-wheat program.

¹ Contribution from the Department of Agronomy, Oklahoma Agr. Exp. Sta., as part of Projects S-974 and H-1366. Journal Manuscript no. 1709.

² Graduate Student and Associate Professor, respectively, Agronomy Department, Oklahoma State University, Stillwater.

Received for publication January 21, 1969. Accepted for publication December 11, 1969.