HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Davidson, J. M. Articles by McDougal, J. R. Search for Related Content PubMed Articles by Davidson, J. M. Articles by McDougal, J. R. Agricola Articles by Davidson, J. M. Articles by McDougal, J. R.

Experimental and Predicted Movement of Three Herbicides in a Water-Saturated Soil¹

ABSTRACT

The equilibrium adsorption characteristics of 1,1-dimethyl-3-(a,a,a-trifluoro-m-tolyl) urea (fluometuron), 4-amino-3,5,6-trichloropicolinic acid (picloram), and 2,4-bis(isopropylamino)-6-(methylthio)-s-triazine (prometryne) on Ca-saturated Norge loam soil were measured and were found to fit the Freundlich equation. A solution of each herbicide was displaced through a water-saturated colume of Norge loam soil at various average pore-water velocities (5.6 to 0.57 cm/hour) and effluent samples evaluated to determine the importance of adsorption kinetics to the mobility of the herbicide. The displacement of each herbicide through the soil was significantly influenced by the average pore-water velocity. The use of a kinetic adsorption model in a convective transport equation did not adequately predict the shape of the effluent concentration distribution at the high pore-water velocities, but did give the left-hand shift exhibited by the data. The tailing noted in all the herbicide effluent concentration distributions resulted primarily from the nonsingularity between the adsorption-desorption process. Equilibrium adsorption and desorption isotherms were measured for picloram on Ca-saturated Norge loam soil.

Key Words: herbicide movement • kinetic adsorption-desorption • dispersion • pore-water velocity • equilibrium adsorption

¹ Contribution from the Department of Agronomy and the Department of Electrical Engineering. The study was supported by the Oklahoma Agr. Exp. Sta. as part of Project H-1415. Journal Manuscript No. 2491.

² Associate Professor of Agronomy and Assistant Professor of Electrical Engineering, respectively, Oklahoma State University, Stillwater.

Received for publication October 3, 1972.

This article has been cited by other articles:

				G. Alavi, J. Dusek, T. Vogel, R. E. Green, and C. Ray Evaluation of Dual-Permeability Models for Chemical Leaching Assessment to Assist Pesticide Regulation in Hawaii Vadose Zone J., October 8, 2007; 6(4): 735 - 745. [Abstract] [Full Text] [PDF]