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Effect of Nitrate in Irrigation Water on Iron Reduction and Phosphate Release in Anoxic Paddy Soil Condition  

Kim, Byoung-Ho (Division of Life and Environmental Science, Daegu University)
Chung, Jong-Bae (Division of Life and Environmental Science, Daegu University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.43, no.1, 2010 , pp. 68-74 More about this Journal
Abstract
Since ${NO_3}^-$ is amore favorable electron acceptor than Fe, high ${NO_3}^-$ loads function as a redox buffer limiting the reduction of Fe and following release of ${PO_4}^{3-}$ in flooded paddy soil. The effect ${NO_3}^-$ loaded through irrigation water on Fe reduction and ${PO_4}^{3-}$ release in paddy soil was investigated. Pot experiment was conducted where irrigation water containing 5 or 10 mg N $L^{-1}$ of ${NO_3}^-$ was continuously applied at 1 cm $day^{-1}$, and changes of ${NO_3}^-$, $Fe^{2+}$ and ${PO_4}^{3-}$ concentrations in soil solution at 5 and 10 cm depths beneath the soil surface were monitored as a function of time. Irrigation of rice paddy with water containing 5 mg N $L^{-1}$ of ${NO_3}^-$ led to reduced release of $Fe^{2+}$ and prevented solubilization of P at 5 cm depth beneath the soil surface. And application of irrigation water containing 10 mg N $L^{-1}$ of ${NO_3}^-$ could further suppress Fe reduction and solubilization of P through 10 cm depth soil layer beneath the surface. These results suggest that the introduction of high level ${NO_3}^-$ with irrigation water in rice paddy can strongly limit Fe reduction and P solubilization in root zone soil layer in addition to the excessive supply of N to rice plants.
Keywords
Nitrate; Iron; Phosphate; Paddy soil; Oxidation-reduction; Irrigation water;
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Times Cited By KSCI : 1  (Citation Analysis)
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