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 Dell, C. J. Articles by Turco, R. F. Search for Related Content PubMed Articles by Dell, C. J. Articles by Turco, R. F. Agricola Articles by Dell, C. J. Articles by Turco, R. F.

Estimation of Sorption Coefficients for Fungicides in Soil and Turfgrass Thatch

Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907.

^* Corresponding author.

ABSTRACT

Environmental fates of turf-applied fungicides are not well understood. The role of thatch as a sorptive surface for fungicides has not been evaluated. Thatch may decrease mobility of fungicides and decrease their potential to be transported off-site. Batch type sorption studies were conducted to determine sorption coefficients (K_f) for the fungicides triadimefon, [1-(4-chlorophenoxy)-3,3-dimethyl 1-1-(1H-1,2,4-triazol-1-g-1) butanone], vinclozolin [3-(3,5-dichlorophenyl)-5-methyl-5-vinyl-1,3-oxazolidine-2,4-dione], and chloroneb (1,4-dichloro-2,5-dimethoxybenzone) in thatch and in the underlying soil. The K_f values also were derived from octanol/water partitioning coefficients (K_ow) for these and five other compounds. All K_ow values were determined with reverse-phase high pressure liquid chromatography (HPLC) and calculated from physical properties of the fungicides. The K_f values [µmol^(l-n) Lⁿ kg^–1] determined from isotherm data for thatch and soil (respectively) were 90 and 10 for triadimefon, 163 and 21 for chloroneb, and 431 and 47 for vinclozolin. When K_f values were adjusted for organic C content of the sample, the resulting K_ow values were similar for thatch and soil. The K_oc values estimated from HPLC-derived K_ow values were consistently less than those obtained using batch isotherm methods. The K_ow values calculated from physical properties of the fungicides were poorly correlated with measured values. The HPLC method appears to be useful for determining sorption coefficients. Results indicate that thatch substantially increases fungicide sorption, which, in turn, decreases the potential for these compounds to migrate off site.

This article has been cited by other articles:

				H. A. Torbert, K. W. King, and R. D. Harmel Impact of Soil Amendments on Reducing Phosphorus Losses from Runoff in Sod J. Environ. Qual., July 5, 2005; 34(4): 1415 - 1421. [Abstract] [Full Text] [PDF]

				S. Raturi, M. J. Carroll, and R. L. Hill Turfgrass Thatch Effects on Pesticide Leaching: A Laboratory and Modeling Study J. Environ. Qual., January 1, 2003; 32(1): 215 - 223. [Abstract] [Full Text] [PDF]

				D. S. Gardner and B. E. Branham Effect of Turfgrass Cover and Irrigation on Soil Mobility and Dissipation of Mefenoxam and Propiconazole J. Environ. Qual., September 1, 2001; 30(5): 1612 - 1618. [Abstract] [Full Text] [PDF]

				P. J. Rice, L. L. McConnell, L. P. Heighton, A. M. Sadeghi, A. R. Isensee, J. R. Teasdale, A. A. Abdul-Baki, J. A. Harman-Fetcho, and C. J. Hapeman Runoff Loss of Pesticides and Soil: A Comparison between Vegetative Mulch and Plastic Mulch in Vegetable Production Systems J. Environ. Qual., September 1, 2001; 30(5): 1808 - 1821. [Abstract] [Full Text] [PDF]

				D. A. Haith TurfPQ, A Pesticide Runoff Model for Turf J. Environ. Qual., May 1, 2001; 30(3): 1033 - 1039. [Abstract] [Full Text] [PDF]

				D.S. Gardner, B.E. Branham, and D.W. Lickfeldt Effect of Turfgrass on Soil Mobility and Dissipation of Cyproconazole Crop Sci., September 1, 2000; 40(5): 1333 - 1339. [Abstract] [Full Text]