Influence of Water Flux and Porous Material on the Movement of Selected Herbicides1
- J. M. Davidson,
- C. E. Rieck and
- P. W. Santelmann2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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