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Decomposition of Carbon-14 Labeled Atrazine in Soil Samples from Sanborn Field¹

ABSTRACT

Soil samples from corn (Zea mays) and from timothy (Phleum pratense) plots of Sanborn Field, with and without glucose added, were incubated for 6 months after treating with 10 ppm of C¹⁴ ring-labeled atrazine. During the incubation period, < 2% of the ring carbon of atrazine was evolved as CO₂ from the glucoseamended soils and < 1% from the unamended soils. The rate of C¹⁴O₂ evolution from the corn soil did not vary greatly throughout the incubation, whereas, for the timothy soil it peaked at 1 week and then rapidly declined. Evolution of CO₂ from glucose and native organic matter was not influenced by the atrazine treatment. Recovery of unchanged atrazine after concluding the incubation averaged about 10% of that initially added. The bulk of the added C¹⁴ was not extracted in the course of making these measurements but its persistence in the soil was confirmed by total combustion.

¹ Contribution from the Department of Soils, Missouri Agr. Exp. Sta., Missouri Journal Series no. 3083. Approved by the Director. Grateful acknoweldgement is offered to Geigy Agricultural Chemicals Div. of Geigy Chemical Corp. for providing the C-14 atrazine.

² Associate Professor of Soils and formerly Research Associate in Soils, respectively, Univ. of Mo., Columbia. The junior author is presently at Tuskegee Inst., Ala.

Received for publication March 28, 1966. Accepted for publication July 21, 1966.