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Volatilization and Degradation of Soil-Applied Dimethylselenide

^a George E. Brown, Salinity Laboratory, USDA-ARS, 450 W. Big Springs Rd., Riverside, CA 92507
^b Dep. of Environmental Sciences, University of California, Riverside, CA 92521

View larger version (25K): [in a new window]   Fig. 1. Degradation of dimethylselenide in nonsterile and autoclaved Arlington sandy loam as affected by temperature. The soil was autoclaved twice at 120°C for 1 h. Soil moisture content = 30% maximum water holding capacity (WHCmax). Error bars represent the standard deviation of triplicate samples.

View larger version (18K): [in a new window]   Fig. 2. Effect of various soil moisture levels on the degradation of dimethylselenide in Arlington sandy loam. The samples were incubated at 20°C. Error bars represent the standard deviation of triplicate samples.

View larger version (18K): [in a new window]   Fig. 3. Degradation of dimethylselenide in gluten- and casein-amended Arlington sandy loam. The amendments were applied at 1% (dry wt. basis), and the incubation temperature was 20°C. Soil moisture content = 30% maximum water holding capacity (WHCmax). Error bars represent the standard deviation of triplicate samples.

View larger version (22K): [in a new window]   Fig. 4. Relationship between dimethylselenide injection depth and emissions from packed soil columns. The columns were packed with Arlington sandy loam to a bulk density of 1.65 g cm-3 and incubated at room temperature. Soil moisture content = 30% maximum water holding capacity (WHCmax).

View larger version (19K): [in a new window]   Fig. 5. Comparison of various soil moisture levels on dimethylselenide flux from packed soil columns. The columns were packed with Arlington sandy loam to a bulk density of 1.65 g cm-3 and incubated at room temperature. To initiate the experiment, 0.5 mL of dimethylselenide standard was injected 10 cm below the soil surface.

View larger version (22K): [in a new window]   Fig. 6. Effect of organic amendments on dimethylselenide emissions from packed soil columns. The top 5 cm of soil in column was amended with 1% (dry wt. basis) of either gluten or casein. The soil columns were packed to a final bulk density of 1.65 g cm-3 with Arlington sandy loam and incubated at room temperature. Soil moisture content = 30% maximum water holding capacity (WHCmax).