Plant and Soil

, Volume 102, Issue 2, pp 229–237

Effects of carbon and nitrate additions to soil upon leaching of nitrate, microbial predators and nitrogen uptake by plants

  • Karl Ritz
  • Bryan S. Griffiths

DOI: 10.1007/BF02370708

Cite this article as:
Ritz, K. & Griffiths, B.S. Plant Soil (1987) 102: 229. doi:10.1007/BF02370708


Amendments with glucose significantly reduced the amount of nitrate leached from a sandy soil amended with nitrate. The decrease was most likely caused by immobilisation of the nitrate into microbial cells. Populations of ciliates and flagellates and amoebae, but not nematodes, increased 7–14 days following glucose amendments. Mineralisation of the immobilised nitrate occurred during this period. Some of the mineralised nitrogen appeared to be available to ryegrass plants only if the roots exploited most of the soil during the period of maximum predator activity. After 28 days, 44% of the organic N remaining in the soil after leaching was taken up by the plants. The difference developed over the last 2 weeks when amoebal populations were large.

Key words

leaching losses microbial predation nitrate nitrogen mineralisation nitrogen uptake protozoa 

Copyright information

© Martinus Nijhoff Publishers 1987

Authors and Affiliations

  • Karl Ritz
    • 1
  • Bryan S. Griffiths
    • 1
  1. 1.Department of MicrobiologyMacaulay Institute for Soil ResearchAberdeenUK
  2. 2.Department of Mycology and BacteriologyScottish Crop Research InstituteDundeeUK
  3. 3.Department of ZoologyScottish Crop Research InstituteDundeeUK

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