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Micromovement Mechanisms of s-Triazines in Soil¹

ABSTRACT

In situ autoradiography of corn (Zea mays L., var. WF9 x Hy) roots grown in bands of three different soils treated with ¹⁴C ring-labeled s-triazines showed that both mass flow and diffusion of the herbicides occur. Mass flow was the most important means of moving the herbicide to the absorbing root in the case of 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (atrazine) the most water soluble of the herbicides studied. Movement of the soil-applied herbicides to the corn roots did not insure uptake of the chemical. Mass flow patterns were clearly present around roots growing in the band of 2-chloro-4, 6-isopropylamino-s-triazine (propazine) treated Sharpsburg silty clay loam soil; however, the least amount of ¹⁴C uptake occurred on this soil-herbicide combination indicating restrictive herbicide uptake by the plant root.

Adsorption of the s-triazines on the three soils increased as the soil acidity, organic matter, and clay content increased. Plant uptake of ¹⁴C decreased as the soil acidity, organic matter, and clay content increased.

¹ Contribution from the Department of Agronomy, University of Nebraska, Lincoln. Published with the approval of the director as Paper No. 2233, Journal Series, Nebraska Agr. Exp. Sta.

² Assistant Professor, Department of Agronomy, University of Nebraska, Lincoln.

Received for publication October 30, 1967. Accepted for publication January 22, 1968.