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Effect of Petroleum Oils on the Uptake of Atrazine-¹⁴C by Corn

G. E. Coats and C. L. Foy
Weed Science
Vol. 22, No. 3 (May, 1974), pp. 220-226
Stable URL: http://www.jstor.org/stable/4042364
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effect of Petroleum Oils on the Uptake of Atrazine-¹⁴C by Corn
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Abstract

Selected paraffinic and naphthenic phytobland oils used as adjuvants markedly enhanced the foliar uptake and acropetal translocation of ring-labeled atrazine [2-chloro-4-(ethylamino)-6-isopropylamino-s-triazine] by corn (Zea mays L. 'VPI 646'), when compared with atrazine-¹⁴C applied with nonionic polysorbate surfactant or in aqueous 25% methanol alone. Generally, ¹⁴C uptake increased with increasing concentration (1.25 to 20.0%) of a 100-sec viscosity paraffinic oil and with time (up to 32 hr) after application. No consistent additional promotion of atrazine-¹⁴C uptake was derived from the use of emulsifier concentrations above 2.0% in the oil of a 10% oil-in-water emulsion. With a few exceptions, paraffinic and naphthenic oils of comparable viscosities were about equally effective as penetrant aids for atrazine. For both the paraffinic and naphthenic series, the 100-sec viscosity oils appeared to be slightly better penetrant aids than comparable 70, 150, and 200-sec oils.

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