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This article in JEQ

  1. Vol. 7 No. 2, p. 291-293
     
    Received: May 9, 1977


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doi:10.2134/jeq1978.00472425000700020028x

Effects of Trace Elements on Nitrification in Soils

  1. C. N. Liang and
  2. M. A. Tabatabai2

Abstract

Abstract

Studies to evaluate the effects on nitrification of 19 trace elements showed that all these elements inhibited nitrification of NH4+-N added to soils. Results showed that the relative effectiveness of the trace elements in inhibition of nitrification depends on the soils. When the trace elements were compared to using 5 µmoles/g of soil, Ag(I), Hg(II), Cd(II), Ni(II), As(III), Cr(III), B(III), Al(III), Se(IV), and Mo(VI) were the most effective inhibitors (average inhibition >50%), and Mn(II) and Pb(II) the least effective (average inhibition <25%) inhibitors. The average inhibition by the other elements studied [Co(II), Cu(II), Sn(II), Fe(II), Zn(II), Fe(III), V(IV), and W(VI)] ranged from 33% with W(VI) to 49% with Fe(III), Silver(I), Ni(II), Co(II), Zn(II), Mn(II), Pb(II), As(III), B(III), Fe(III), As(V), Mo(VI), and W(VI) inhibited Nitrobacter, causing accumulation of NO2-N in one of the soils used.

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