Summary
We found the highest residue in the organic trash lying on top of the ground of the alfalfa fields and the next highest concentration in the top 1/4′' of soil. Concentrations dropped sharply at lower depths. Analysis of alfalfa crowns from fields previously sprayed with chlordane as a means of predicting residue levels in the next crop gave results comparable to those reported by King (3) and seem to hold for alfalfa harvested the first season following discontinuance of spraying.
Disposal of milk and manure from a contaminated herd by spreading on a field apparently raises the residue level in the surface trash.
Finally, the reliance on the gas Chromatograph alone, even though the analysis of any single sample is done by two or more laboratories, is questionable and an invitation to criticism, as suggested by Bevenue and Beckman (9).
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References
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Boyd, J.C. Field study of a chlordane residue problem: Soil and plant relationships. Bull. Environ. Contam. Toxicol. 6, 177–182 (1971). https://doi.org/10.1007/BF01540102
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DOI: https://doi.org/10.1007/BF01540102