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This article in SSSAJ

  1. Vol. 69 No. 4, p. 1036-1046
     
    Received: Apr 26, 2004
    Published: July, 2005


    * Corresponding author(s): jjwang@agcenter.lsu.edu
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doi:10.2136/sssaj2004.0148

Effect of Ammonium, Potassium, and Sodium Cations and Phosphate, Nitrate, and Chloride Anions on Zinc Sorption and Lability in Selected Acid and Calcareous Soils

  1. Jim Jian Wang * and
  2. Dustin L. Harrell
  1. Dep. of Agronomy and Environmental Management, 313 Sturgis Hall, Louisiana State Univ. Agricultural Center, Baton Rouge, LA. 70803

Abstract

Zinc availability and mobility in soils is controlled by its interaction with the soil matrix and amendments. Contradicting evidence has been reported for factors influencing Zn behavior in soils. This study was conducted to investigate the effect of common cations and anions on Zn sorption and lability characteristics. Zinc sorption isotherms were conducted on three acid and four calcareous soils in NH4 +, K+, and Na+ and H2PO4 , NO3 and Cl backgrounds. Lability of the sorbed Zn was evaluated by DTPA following sorption. Calcareous soils exhibited greater Zn sorption than did acid soils. Predicted Langmuir maxima for Zn sorption differed among the various ionic backgrounds. A majority of the total sorbed Zn (60–96%) was recoverable in the labile fraction. Both NH4 + and K+ equally decreased Zn sorption, as opposed to Na+ in acid and calcareous soils; however NH4 + yielded 4 to 12% more of sorbed Zn into the labile pool than did K+ in acid soils. Zinc sorption was enhanced by H2PO4 as opposed to Cl or NO3 in acid soils, but it was decreased in three out of four calcareous soils. The effect of H2PO4 on the lability of the sorbed Zn in acid soils was similar to that of Cl or NO3 , but in calcareous soils the phosphate held 10-25% more of the sorbed Zn in the nonlabile pool. It was concluded that even in calcareous soils, total Zn sorption could be impacted by phosphate–Fe oxide interactions. Furthermore, the effect of background ions on the lability of sorbed Zn varied between acid and calcareous soils. These results have important implications on Zn management in relation to other nutrients.

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Copyright © 2005. Soil Science SocietySoil Science Society of America

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