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Measuring Flux of Soil Fumigants Using the Aerodynamic and Dynamic Flux Chamber Methods

Dow AgroSciences, 9330 Zionsville Rd., Building 306/A2, Indianapolis, IN 46268

View larger version (13K): [in this window] [in a new window]   Fig. 1. Cross-section of flux chambers placed on the bed and in the furrow.

View larger version (24K): [in this window] [in a new window]   Fig. 2. Flux density and cumulative mass volatilization of 1,3-Dichloropropene (1,3-D) calculated using the aerodynamic (AD) method.

View larger version (21K): [in this window] [in a new window]   Fig. 3. Flux density and cumulative mass volatilization of chloropicrin volatilized as calculated using the aerodynamic (AD) method.

View larger version (19K): [in this window] [in a new window]   Fig. 4. Comparison of 1,3-Dichloropropene (1,3-D) flux density predictions for the aerodynamic (AD) method and the flux chamber (FC) method.

View larger version (18K): [in this window] [in a new window]   Fig. 5. Comparison of chloropicrin flux density predictions for the aerodynamic (AD) method and the flux chamber (FC) method (first data point is Period 2, afternoon).

View larger version (15K): [in this window] [in a new window]   Fig. 6. Difference between 1,3-Dichloropropene (1,3-D) flux measured by aerodynamic (AD) method and flux chamber (FC) method. Solid symbols (•) are nighttime sample periods, open symbols () are daytime periods.

View larger version (24K): [in this window] [in a new window]   Fig. 7. 1,3-Dichloropropene (1,3-D) and chloropicrin concentrations in soil gas at (a) the 15- and 60-cm depth below the center of the bed (COB) and (b) the 15- and 30-cm depth below the center of the furrow.

View larger version (19K): [in this window] [in a new window]   Fig. 8. Florida (FL) site comparison of flux chamber estimates of 1,3-Dichloropropene (1,3-D) and chloropicrin flux density for beds tarped with high density polyethylene (HDPE) and virtually impermeable (VIF) film. A = afternoon, N = night, M = morning sampling period.