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Effect of Added Plant Tissue on Decomposition of Soil Organic Matter Under Different Wetting and Drying Cycles¹

ABSTRACT

The so-called priming effect occurred during the first 22 days when C¹⁴ labeled soybean (Glycine max) stems or leaves were added to Cecil and Bladen soils under constant moisture and under wetting and drying cycles. After 96 days the effect of added plant tissue upon native soil organic matter decomposition was significant for Cecil but not for Bladen soil Wetting and drying greatly increased soil organic matter decomposition and increased the priming effect in the Bladen soil for the first incubation period but decreased this effect in the Cecil soil.

¹ Contribution from the University of Georgia, Department of Agronomy, Athens. Approved by the Director of the College Experiment Station as Journal Paper no. 464.

² Graduate student and Professor of Agronomy, respectively.

Received for publication December 13, 1965. Accepted for publication March 21, 1966.