INFLUENCE OF TRACE METALS ON CARBON DIOXIDE EVOLUTION FROM A YOLO SOIL

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Abstract
We measured carbon dioxide production in Yolo silt loam amended with alfalfa meal and sewage sludge after the addition of solutions of chromium, cadmium, copper, lead, manganese, and zinc at concentrations ranging from 0 to 400 parts per million. Quantities of these metals extractable with water, KNO3, DTPA, and HNO3 were determined at the end of the experiment. Threshold concentrations of metals, defined as the concentration required for 10 percent inhibition of CO2 production, were in the sequence PbCd>Cu>Mn = Zn. An addition of only 8.6 ppm of Cr to this soil is sufficient to inhibit CO2 evolution by 10 percent, whereas the addition of about 27 ppm of Pb would be required to produce the same effect. We measured carbon dioxide production in Yolo silt loam amended with alfalfa meal and sewage sludge after the addition of solutions of chromium, cadmium, copper, lead, manganese, and zinc at concentrations ranging from 0 to 400 parts per million. Quantities of these metals extractable with water, KNO3, DTPA, and HNO3 were determined at the end of the experiment. Threshold concentrations of metals, defined as the concentration required for 10 percent inhibition of CO2 production, were in the sequence PbCd>Cu>Mn = Zn. An addition of only 8.6 ppm of Cr to this soil is sufficient to inhibit CO2 evolution by 10 percent, whereas the addition of about 27 ppm of Pb would be required to produce the same effect. © Williams & Wilkins 1981. All Rights Reserved.