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Volatilization of Fonofos, Chlorpyrifos, and Atrazine from Conventional and No‐Till Surface Soils in the Field
Author(s) -
Whang J. M.,
Schomburg C. J.,
Glotfelty D. E.,
Taylor A. W.
Publication year - 1993
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/jeq1993.00472425002200010023x
Subject(s) - volatilisation , atrazine , chemistry , soil water , pesticide , chlorpyrifos , environmental chemistry , residue (chemistry) , tillage , mulch , agronomy , environmental science , soil science , organic chemistry , biology
We measured the effect of no‐till on pesticide volatilization in a side‐by‐side comparison of volatilization rates from no‐till (NT) and conventionally tilled (CT) fields. Volatilization rates were determined using the theoretical profile shape method for 10 of the 26 d following application. Soil and mulch residues were also measured. Volatilization losses of fonofos ( O ‐ethyl S ‐phenyl ethylphosphonodithioate) and chlorpyrifos [ O,O ‐diethyl O ‐(3,5,6‐trichloro‐2‐pyridyl) phosphorothioate] from the NT field were two to four times volatilization losses from the CT field. As much as one‐half of the application volatilized during 26 d. Volatilization of atrazine [6‐chloro‐ N ‐ethyl‐ N ′‐(1‐methylethyl)‐ 1,3,5‐triazine‐2,4‐diamine] was also greater from NT, but only 1 to 2% of the application volatilized. Maximum volatilization rates were usually measured at midday, indicating that volatilization was not limited by soil dryness. Over the 26 d of the experiment, volatilization decreased faster than pesticide residue was depleted, suggesting residues were becoming more strongly sorbed to soil and/or mulch, or were becoming less accessible to the surface.