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Transport of Atrazine and Simazine in Runoff from Conventional and No-Tillage Corn¹

ABSTRACT

On 0.4- to 3.5-ha watersheds, highest concentrations of atrazine (0.48 ppm) (2-chloro-4-[ethylamino]-6-[isopropylamino]-s-triazine) and simazine (1.2 ppm) (2-chloro-4,6-bis[ethylamino]-s-triazine) were present in runoff occurring soon after application and declined rapidly for later events. Quantity of herbicides transported increased with the amount of runoff, and was inversely related to the length of time between application and the runoff event. A maximum of 6% of the applied herbicide was transported from the field even under the most favorable conditions, and the average for all watersheds was < 2%. Less runoff and herbicide loss occurred from areas planted to no-tillage than to conventional corn (Zea mays L.).

In a multiple regression analysis of the factors, the natural logarithm (ln) of days after application and a tillage x application rate interaction were useful in predicting the natural logarithm of herbicide concentration in runoff. Factors from the multiple regression analysis used in this study were important in predicting concentration of atrazine and other pesticides when applied to data published by other workers.

Key Words: pesticide movement

¹ Contribution of the Ohio Agric. Res. and Dev. Center, Wooster, OH 44691 and the North Appalachian Exp. Watershed USDA-ARS, Coshocton, OH 43812. Published with approval of the Director as Pap. no. 146-76.

² Professor of Agronomy, OARDC; Senior Technical Sales Service Specialist, Agric. Div., CIBA-GEIGY Corp., Greensboro, N.C.; and Soil Scientist, USDA-ARS, North Appalachian Exp. Watershed, Coshocton, Ohio, respectively.

Received for publication March 31, 1977.

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