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Influence of Water Flux and Porous Material on the Movement of Selected Herbicides¹

ABSTRACT

The rate at which two substituted urea herbicides move through a water-saturated glass bead and uniformly packed soil column depends upon the water flux or average pore velocity. A 200-ml slug of 0.01N CaSO₄ solution containing either fluometuron (3-(m-trifluoromethylphenyl)-1,1-dimethylurea) or diuron (3-(3,4-dichlorophenyl)-1,1-dimethylurea) was introduced at one end of a 30-cm long column at a specific flux and the herbicide displaced through a column with 0.01N CaSO₄ at the same water flux. Effluent samples collected every 5-ml show fluometuron and the chloride ion to mix in a similar manner at the two fluxes studied. Experimental and calculated effluent concentration distributions did not agree when fluometuron was retained by the porous material.

¹ Contribution from the Department of Agronomy, Oklahoma Agr. Exp. Sta. as part of Projects S-1310 and S-1324. Journal Manuscript no. 1567.

² Associate Professor, Instructor, and Professor, respectively, Agronomy Department, Oklahoma State Univ., Stillwater.

Received for publication December 14, 1967. Accepted for publication June 3, 1968.