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Effect of Nitrate on Iron Reduction and Phosphorus Release in Flooded Paddy Soil
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 Title & Authors
Effect of Nitrate on Iron Reduction and Phosphorus Release in Flooded Paddy Soil
Chung, Jong-Bae;
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The increase in P availability to rice under flooded soil conditions involves the reductive dissolution of iron phosphate and iron (hydr)oxide phosphate. However, since is a more favourable electron acceptor in anaerobic soils than Fe, high loads function as a redox buffer limiting the reduction of Fe. The effect of adding on Fe reduction and P release in paddy soil was investigated. Pot experiment was conducted where was added to flooded soil and changes of redox potential and , and concentrations in soil solution at 10 cm depth were monitored as a function of time. Redox potential decreased with time to -96 mV, but it was temporarily poised at about 330360 mV when was present. Nitrate addition to soil led to reduced release of and prevented the solubilization of P. Phosphate in pore water began to rise soon after incubation and reached final concentrations about 0.82 mg P/L in the soil without addition. But, in the soil with addition, in pore water was maintained in the range of 0.20.3 mg P/L. The duration of inhibition in release was closely related to the presence of , and the timing of release was inversely related to the concentration in soil solution. The results suggest that preferential use of as an electron acceptor in anaerobic soil condition can strongly limit Fe reduction and P solubilization.
nitrate;iron;phosphate;paddy soil;oxidation-reduction;
 Cited by
관개용수 중의 질산 이온이 논토양의 철 환원과 인 용출에 미치는 영향,김병호;정종배;

한국토양비료학회지, 2010. vol.43. 1, pp.68-74
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