Nitrate uptake rate

G. Cacco, E. Attina, A. Gelsomino, and M. Sidari, Effect of nitrate and humic substances of different molecular size on kinetic parameters of nitrate uptake rate in wheat. seedlings. 3. Plant Nittr. Soil Sci. 763 313 (2000). 

H. Mar.schner, M. Haussling, and E. George, Ammonium and nitrate uptake rates and rhizoshpere-pH in non-mycorrhizal roots of Norway spruce [Picea ahies (L.) Karst.). Trees Struct. Funct. 5 14 (1991). 

Anoxic conditions in wastewater of sewer networks require availability of nitrate or other oxidized nitrogen compounds and an extremely low DO concentration. Such conditions are generally not of major importance because of the low nitrate concentrations that typically occur in wastewater. However, anoxic conditions in sewers are artificially established when nitrate is used to control sulfide problems (Section 6.2.7). A low nitrate uptake rate (NUR) is preferred, in this case, to keep the nitrate consumption low for economic reasons. 

The microbial activity of wastewater under anoxic conditions is lower compared with aerobic conditions (Abdul-Talib et al., 2001). This is important to consider, because a low nitrate uptake rate (NUR) compared with the oxygen uptake rate (OUR) in units of electron equivalents means a reduced transformation rate of the most biodegradable fractions of the organic matter. As mentioned under the point on injection of air, this may have implications in terms of treatment. Furthermore, a relatively low NUR value also has operational advantages because of a reduced demand for nitrate to suppress sulfide formation. 

Dickson, M. L., and Wheeler, P. A. (1995). Nitrate uptake rates in a coastal upwelhng regime A comparison of PN-specific, absolute, and Chi a-specific rates. Limnol. Oceanogr. 40, 533—543. 

Dugdale, R. C., and Wilkerson, F. P. (1991). Low specific nitrate uptake rate A common feature of high-nutrient low-chlorophyU marine ecosystems. Limnol. Oceanogr. 36, 1678—1688. 

Table 17.2 Examples of published maximum nitrate uptake rates (surface) in coastal upwelling areas...

Marschner H., Husshng M., and George E. (1991) Ammonium and nitrate uptake rates and rhizosphere pH in non-... 

Our same research group used tracer to measure the rate of inorganic N-uptake by phytoplankton to evaluate the relative importance of nitrogen cycling mechanisms for phytoplankton productivity in aquatic ecosystems (17), We measured nitrate uptake rates of 54.2 it 14.6 ftg-N/h in an oligotrophic lake. The precision of these measurements as well as the wide range over which they have been effectively used demonstrate the advantages of short-lived radioisotopes for tracer biochemistry. 

M. C. Drew, L. R. Saker, Nutrient supply and the growth of the seminal root system in barley II. Localized compensatory changes in lateral root growth and the rates of nitrate uptake when nitrate is restricted to only one part of the root system. J. E.xp. Bot. 26 79 (1976). 

Concerning nitrate uptake and assimilation (Albuzio et al., 1986) in barley seedlings incubated with HS from a grassland soil and their fractions—nitrate reductase (NR), glutamate dehydrogenase (GDH),and glutamine synthetase (GS) activities— were analyzed together with the rate of nitrate uptake. The enzymatic activities turned out to be stimulated by the treatment of unfractioned humus extract with increases compared to controls of 65%, 35% and 45% respectively. 

CoUos, Y. (1983). Transient situations in nitrate assimilation by marine diatoms. IV. Non-hnear phenomena and the estimation of the maximum uptake rate. f. Plankton Res. 5, 677—691. 

Franck, V. M., Smith, G. J., Bruland, K. W., and Brzezinski, M. A. (2005). Comparison of size-dependent carbon, nitrate, and srhcic acid uptake rates in high- and low-iron waters. Dmnol. Oceanogr. 50, 825—838. 

Lipschukz (2001) Report on the temporal variabihty of nitrate and ammonium (nanomolar) concentrations and uptake rates in the ohgotrophic upper layer. Nitrate uptake during the ohgotrophic periods does not strongly contribute to new production it is locally regenerated... 

Table 2.4 Uptake (A) and Release (B) rates of DIP, ammonium, and nitrate in mmolm 2 day and (C) uptake rate coefficients (S, where rate = S x Concentration) for each nutrient in m day-1...

Figure 8 Bottle enrichment experiments show that the silicate nitrate uptake ratio changes as a function of the iron added. This is thought to be due to the increased rate of iron uptake relative to silicate in these experimental treatments.

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