The variability of nitrifying activity in field soils |
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| Authors: | R. G. V. Bramley R. E. White |
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| Affiliation: | (1) Department of Soil Science, Massey University, Palmerston North, New Zealand;(2) Present address: CSIRO, Division of Animal Production, Private Bag, 6014 Wembley, WA, Australia |
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| Abstract: | The effect of pH on the activity of nitrifying organisms was examined in pasture soils ranging in pH from 4.9 to 7.3, using a short-term nitrification assay (SNA). The optimum pH for nitrifier activity (pHopt) was generally close to the soil pH, suggesting that the indigenous nitrifier populations adjusted to the prevailing soil pH. A consequence was that the SNA at the soil pH (SNApH) bore a near 1:1 relationship with the SNA at the pHopt (SNAopt) over a wide range of SNA values. The effect of soil moisture tension on the SNA was less pronounced than that of pH, but an optimum occurred around pF 3.4. |
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| Keywords: | moisture nitrification nitrifiers pH soil variability |
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