Abstract
Three aspects of the nitrate production in natural ecosystems are discussed,i.e. the population biology of nitrifying bacteria, the nitrate-producing activity of these organisms and the uptake of nitrate by higher plants. It is concluded that the three methods used in enumerating the nitrifying bacteria,i.e. the Most Probable Number method, the Fluorescent Antibody technique and the Potential Nitrification Rate, all have serious drawbacks and count different segments of the nitrifying populations.
From the number of nitrifying bacteria no reliable estimate of the rate production can be obtained and also estimates that are made using field-incubation and15N−NH +4 techniques do not yield reliable data. Possibly the best results can be obtained using Schimel's method to estimate the actual nitrification rate using15N−NO −3 , but this method has still not been tested under different sets of soil conditions.
From the nitrate reductase activity and the chemical composition of the plant a picture can be obtained of the quantities of nitrate and ammonium that have been taken up. However, it is shown that nitrate and ammonium are taken up in different proportions that they are produced. It is concluded that the various parameters have to be studied simultaneously, preferably in defined systems with plants, in which the participating organisms are known.
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Woldendorp, J.W., Laanbroek, H.J. Activity of nitrifiers in relation to nitrogen nutrition of plants in natural ecosystems. Plant Soil 115, 217–228 (1989). https://doi.org/10.1007/BF02202590
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DOI: https://doi.org/10.1007/BF02202590