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Effect of Turfgrass Cover and Irrigation on Soil Mobility and Dissipation of Mefenoxam and Propiconazole
Author(s) -
Gardner D. S.,
Branham B. E.
Publication year - 2001
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2001.3051612x
Subject(s) - propiconazole , irrigation , agronomy , pesticide , chemistry , horticulture , zoology , fungicide , biology
Irrigation effects on pesticide mobility have been studied, but few direct comparisons of pesticide mobility or persistence have been conducted on turfgrass versus bare soil. The interaction of irrigation practices and the presence of turfgrass on the mobility and dissipation of mefenoxam [ N ‐(2,6‐dimethylphenyl)‐ N ‐(methoxyacetyl)‐ D ‐alanine methyl ester] and propiconazole (1‐[[2‐(2,4‐dichlorophenyl)‐4‐propyl‐1,3‐dioxolan‐2‐yl]methyl]‐1 H ‐1,2,4‐triazole) was studied. Sampling cylinders (20‐cm diam.) were placed in either creeping bentgrass [ Agrostis stolonifera L. var. palustris (Huds.) Farw.] or bare soil. Mefenoxam was applied at 770 g a.i. ha −1 and propiconazole was applied at 1540 g a.i. ha −1 on 14 June 1999. Sampling cylinders were removed 2 h after treatment and 4, 8, 16, 32, and 64 days after treatment (DAT) and the cores were sectioned by depth. Dissipation of mefenoxam was rapid, regardless of the amount of surface organic matter or irrigation. The half‐life ( t 1/2 ) of mefenoxam was 5 to 6 d in turf and 7 to 8 d in bare soil. Most mefenoxam residues found in soil under turfgrass were in the 0‐ to 1‐cm section at 0, 4, and 8 DAT. Residues were found in the 15‐ to 30‐cm section at 4, 8, 16, 32, and 64 DAT, regardless of turf cover or irrigation. The t 1/2 of propiconazole was 12 to 15 d in turfgrass and 29 d in bare soil. Little movement of propiconazole was observed in either bare soil or turf.