Decomposition of Carbon-14 Labeled Atrazine in Soil Samples from Sanborn Field
1966
Wagner, G. H. | Chahal, K. S.
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.
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