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Impact of Rice Straw Incorporation on Soil Redox Status and Sulfide Toxicity

Dep. of Agron. and Range Sci., Univ. of California, Davis, CA 95616

View larger version (25K): [in a new window]   Fig. 1. Redox potential (EH) in soil solution. (Treatments: St0 = 0 g straw kg–1 soil; St1 = 6 g straw kg–1 soil; St2 = 23 g straw kg–1 soil; S0 = 0 mg SO4 kg–1 soil; S1 = 160 mg SO4 kg–1 soil; S2 = 800 mg SO4 kg–1 soil.)

View larger version (18K): [in a new window]   Fig. 2. Dissolved oxygen (DO) concentrations in soil solution. (Treatments: St0 = 0 g straw kg–1 soil; St1 = 6 g straw kg–1 soil; St2 = 23 g straw kg–1 soil; S0 = 0 mg SO4 kg–1 soil; S1 = 160 mg SO4 kg–1 soil; S2 = 800 mg SO4 kg–1 soil.)

View larger version (18K): [in a new window]   Fig. 3. Nitrate concentrations in soil solution. (Treatments: St0 = 0 g straw kg–1 soil; St1 = 6 g straw kg–1 soil; St2 = 23 g straw kg–1 soil; S0 = 0 mg SO4 kg–1 soil; S1 = 160 mg SO4 kg–1 soil; S2 = 800 mg SO4 kg–1 soil.)

View larger version (30K): [in a new window]   Fig. 4. Manganese (II) concentrations in soil solution. (Treatments: St0 = 0 g straw kg–1 soil; St1 = 6 g straw kg–1 soil; St2 = 23 g straw kg–1 soil; S0 = 0 mg SO4 kg–1 soil; S1 = 160 mg SO4 kg–1 soil; S2 = 800 mg SO4 kg–1 soil.)

View larger version (29K): [in a new window]   Fig. 5. Ferrous Fe concentrations in soil solution. (Treatments: St0 = 0 g straw kg–1 soil; St1 = 6 g straw kg–1 soil; St2 = 23 g straw kg–1 soil; S0 = 0 mg SO4 kg–1 soil; S1 = 160 mg SO4 kg–1 soil; S2 = 800 mg SO4 kg–1 soil.)

View larger version (25K): [in a new window]   Fig. 6. Sulfate concentration in soil solution. (Treatments: St0 = 0 g straw kg–1 soil; St1 = 6 g straw kg–1 soil; St2 = 23 g straw kg–1 soil; S0 = 0 mg SO4 kg–1 soil; S1 = 160 mg SO4 kg–1 soil; S2 = 800 mg SO4 kg–1 soil.)

View larger version (24K): [in a new window]   Fig. 7. Sulfide concentration (H2S and HS–) in soil solution. (Treatments: St0 = 0 g straw kg–1 soil; St1 = 6 g straw kg–1 soil; St2 = 23 g straw kg–1 soil; S0 = 0 mg SO4 kg–1 soil; S1 = 160 mg SO4 kg–1 soil; S2 = 800 mg SO4 kg–1 soil.)

View larger version (30K): [in a new window]   Fig. 8. Dissolved methane concentration in soil solution. (Treatments: St0 = 0 g straw kg–1 soil; St1 = 6 g straw kg–1 soil; St2 = 23 g straw kg–1 soil; S0 = 0 mg SO4 kg–1 soil; S1 = 160 mg SO4 kg–1 soil; S2 = 800 mg SO4 kg–1 soil.)