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Use of Dye Infiltration Experiments to Describe the Variation in Atrazine Distribution in the Upper Soil Layer of a No-Till Field

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Pp. 273-276 in Preferential Flow, Water Movement and Chemical Transport in the Environment, Proc. 2nd Int. Symp. (3-5 January 2001, Honolulu, Hawaii, USA), eds. D. D. Bosch and K. W. King. St. Joseph, Michigan: ASAE  701P0006.(doi:10.13031/2013.2119)
Authors:   S.K. Neurath, A..M. Sadeghi, A. Shirmohammadi, A. Isensee, and A. Torrents
Keywords:   Pesticide, Transport, Preferential Flow, Macropore Flow

Small-scale dye experiments estimated infiltration spatial variation, and compared it to previously measured variations in the distribution of atrazine residue in the 0-10 cm layer. Infiltration variation was estimated by measuring dye concentration in soil samples from the 0-3, 3-6, and 6-10 cm depths of the test volume. Contour maps estimated the percentage of infiltration area with a higher than average concentration. Results indicate that: 1) average dye concentration in the upper soil layers was higher and less variable than middle and lower layers; 2) most of the solution passed through 23% of the infiltration area, and 3) variation is greater for infiltration than atrazine residue for this field. This suggests that, under ponded infiltration, preferential flow rapidly began to affect the distribution of infiltrating water. In addition, the variation in atrazine residue may be driven by infiltration variation, however the effect is likely dampened by sorption and/or dissipation processes.

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