Summary
The concentration of nickel in some soils may be insufficient to meet the requirements of enzymes such as urease in soybeans and hydrogenase in Rhizobium. In an initial evaluation of nickel availability, several soils were examined for nickel content and microbial urease activity. Total and extractable nickel were determined by atomic emission spectrometry. Purified glucose and urea were added to soils to stimulate microbial growth and urease activity, the latter of which was monitored by the rate of decomposition of14C urea. Nickel also was added to some samples to determine if the indigenous supply was limiting. In one low-nickel soil (total Ni 13 ppm) urease activity increased 150% in response to additional nickel, while other soils (total Ni 22–3491 ppm) failed to respond to nickel. However, additional nickel did stimulate urease activity (up to 109%) in 3 out of 10 soils to which purified CaCO3 was added. Presumably the rise in pH associated with this treatment decreased nickel availability. Additions of Co, Mn, Fe, or Cu had no consistent effect on urease activity, thus indicating that the response to Ni was specific. Nickel fertilization increased leaf urease and nodule hydrogenase activity of soybeans grown in low-nickel soil, however, yield was not improved. These results may have practical implications in the nutrition of plants and micro-organisms that metabolize H2 and urea.
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Dalton, D.A., Evans, H.J. & Hanus, F.J. Stimulation by nickel of soil microbial urease activity and urease and hydrogenase activities in soybeans grown in a low-nickel soil. Plant Soil 88, 245–258 (1985). https://doi.org/10.1007/BF02182451
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DOI: https://doi.org/10.1007/BF02182451