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Plant and Soil

, Volume 50, Issue 1–3, pp 99–111 | Cite as

Nitrification activities and the changes in the populations of nitrifying bacteria in soil perfused at two different H-ion concentrations

  • S. U. Sarathchandra
Article

Summary

The rate of nitrification by soil aggregates at pH 5.5 and 7.5 was examined by a perfusion technique. Nitrification occurred at both levels of H-ion concentration but at the higher pH the rate of nitrification was greater. The population estimates of nitrifying bacteria were correspondingly greater at the high pH. Once the pH was lowered from 7.5 to 5.5, the nitrification rate decreased slowly with a corresponding decrease in the numbers of nitrifying bacteria. The distribution of nitrifying bacteria throughout soil aggregates was homogenous. The lower limit of pH for nitrification was 4.3.

Keywords

Nitrification Plant Physiology Lower Limit Population Estimate Nitrification Rate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Martinus Nijhoff 1978

Authors and Affiliations

  • S. U. Sarathchandra
    • 1
  1. 1.Ruakura Agricultural Research CentreHamiltonNew Zealand

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