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Partitioning and Persistence of Trichlorfon and Chlorpyrifos in a Creeping Bentgrass Putting Green

^a Dep. of Environ. Sci., Univ. of California, Riverside, CA 92521
^b Dep. of Botany and Plant Sci., Univ. of California, Riverside, CA 92521
^c Inst. of Mountain Hazard and Environ., Chinese Academy of Sci., Chengdu, China 610041
^d U.S. George Brown Salinity Lab., USDA-ARS, Riverside, 450 W. Big Spring, Riverside, CA 92507

View larger version (25K): [in a new window]   Fig. 1. Volatilization fluxes of trichlorfon and chlorpyrifos after application to a bentgrass putting green under southern California conditions. The data points (symbols) are the means of the four treated plots (replications) in 1996 and three plots in 1997, and the error bar represents 1 SD.

View larger version (22K): [in a new window]   Fig. 2. Amount of trichlorfon and chlorpyrifos removed in turfgrass clippings after treatment (µg m-2 d-1). The data points (symbols) are the means of four treated plots (replications) in 1996 and three plots in 1997, and the error bar represents 1 SD.

View larger version (40K): [in a new window]   Fig. 3. (a) Distribution of trichlorfon at different depths in turf plots after application. (b) Distribution of chlorpyrifos at different depths in turf plots after application.

View larger version (27K): [in a new window]   Fig. 4. Leaching rate (µg m-2 d-1) of trichlorfon and chlorpyrifos in 1996. The data points (symbols) are the means of four treated plots (replications) in 1996 and three plots in 1997, and the error bar represents 1 SD.