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Estimating Turf Pesticide Volatilization from Simple Evapotranspiration Models
Author(s) -
Walden Rebecca R.,
Haith Douglas A.
Publication year - 2003
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/jeq2003.1138
Subject(s) - volatilisation , evapotranspiration , environmental science , vaporization , penman–monteith equation , atmospheric sciences , pesticide , hydrology (agriculture) , chemistry , ecology , geotechnical engineering , organic chemistry , engineering , biology , geology
ABSTRACT A previously developed model by Haith et al. (2002) related pesticide volatilization from turf to evapotranspiration (ET) by scaling factors determined from vapor pressures and heats of vaporization. Although the model provided volatilization estimates that compared well with field measurements, it relied on the Penman ET equation, requiring hourly temperature, wind speed, and solar radiation data, none of which are routinely available at field sites. The current study determined that the volatilization model works equally well with a simpler ET equation requiring only daily temperatures. Three daily temperature‐based ET models were evaluated as vehicles for estimating pesticide volatilization from turf: Hamon, Hargreaves–Samani, and a modified Priestley–Taylor. When compared with field volatilization measurements for eight pesticides, volatilization estimates produced from the Hargreaves–Samani model most closely approximated both the field observations and the previous estimates based on the more data‐intensive Penman model. Mean estimated volatilization exceeded mean observations by 15% and the coefficient of variation ( R 2 ) between estimates and observations was 0.65. The comparable values based on Penman ET were 17% and 0.63, respectively.