Effects of carbon and nitrate additions to soil upon leaching of nitrate, microbial predators and nitrogen uptake by plants
- Cite this article as:
- Ritz, K. & Griffiths, B.S. Plant Soil (1987) 102: 229. doi:10.1007/BF02370708
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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.