Influence of Trace Metals on Some Soil Nitrogen Transformations

All metals reverted quickly to more insoluble forms

F.-H. Chang


Scholarcy highlights

  • All metals reverted quickly to more insoluble forms
  • Samples of Yolo silt loam amended with 100 ppm NH4‐N, 1% sewage sludge, and 1% ground alfalfa were treated with solutions to provide 100, 200, and 400 ppm of Cd(II), Cr(III), Cu(II), Mn(II), Pb(II) and Zn(II), and incubated for 2, 4, 8, and 12‐week periods
  • Metals were determined by extracting with water, KNO3, DTPA, and HNO, at the end of each incubation period
  • Quantities of metals extractable with water + KNO3 + DTPA decreased with time, while corresponding increases in HNO3‐soluble forms occurred
  • At low levels of metal addition Mn and Pb stimulated N immobilization, but at 400 ppm all metals were inhibitory to all N transformations
  • Among the six metals studied the sequence in order of decreasing inhibition was Cr > Cd > Cu > Zn > Mn > Pb. it was concluded that N transformation rates may be affected by trace metals in soils receiving heavy sludge applications
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