Interdependence of Root and Shoot Activities in Determining Nitrogen Uptake Rate of Roots

1978 ◽  
Vol 139 (3) ◽  
pp. 289-294 ◽  
Author(s):  
C. David Raper, ◽  
Deanna L. Osmond ◽  
Mien Wann ◽  
Willard W. Weeks
Keyword(s):  
Nitrogen Uptake ◽  
Uptake Rate ◽  
Nitrogen Uptake Rate

scholarly journals Cyclic Variations in Nitrogen Uptake Rate in Soybean Plants

1985 ◽  
Vol 78 (2) ◽  
pp. 320-322 ◽  
Author(s):  
Leslie C. Tolley ◽  
C. David Raper
Keyword(s):  
Nitrogen Uptake ◽  
Uptake Rate ◽  
Cyclic Variations ◽  
Nitrogen Uptake Rate ◽  
Soybean Plants

scholarly journals Cyclic Variations in Nitrogen Uptake Rate of Soybean Plants

1989 ◽  
Vol 91 (4) ◽  
pp. 1345-1350 ◽  
Author(s):  
Leslie Tolley Henry ◽  
C. David Raper
Keyword(s):  
Nitrogen Uptake ◽  
Uptake Rate ◽  
Cyclic Variations ◽  
Nitrogen Uptake Rate ◽  
Soybean Plants

scholarly journals Estimation of Nitrogen Uptake Rate of Small Zooplankton Using 15N tracer.

1992 ◽  
Vol 53 (4) ◽  
pp. 273-280
Author(s):  
Tadafumi ICHIKAWA ◽  
Takahito YOSHIOKA ◽  
Eitaro WADA ◽  
Hidetake HAYASHI
Keyword(s):  
Nitrogen Uptake ◽  
Uptake Rate ◽  
15N Tracer ◽  
Nitrogen Uptake Rate

scholarly journals Performance of Full-Scale Thermophilic Membrane Bioreactor and Assessment of the Effect of the Aqueous Residue on Mesophilic Biological Activity

Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1754
Author(s):  
Maria Cristina Collivignarelli ◽  
Marco Carnevale Miino ◽  
Francesca Maria Caccamo ◽  
Marco Baldi ◽  
Alessandro Abbà
Keyword(s):  
Uptake Rate ◽  
High Strength ◽  
Acute Effect ◽  
Full Scale ◽  
A Value ◽  
Nitrogen Uptake Rate ◽  
High Concentrations ◽  
Input Load ◽  
Positive Effect ◽  
Sludge Production

To date, the management of high-strength wastewater represents a serious problem. This work aims to evaluate the performance on chemical pollutants and on sludge production of one of the two full-scale thermophilic membrane bioreactors (ThMBRs) currently operational in Italy, based on monitoring data of the last two and a half years. Removal yields on COD, N-NOx, non-ionic and anionic surfactants (TAS and MBAS), increased with the input load up to 81.9%, 97.6%, 94.7%, and 98.4%, respectively. In the period of stability, a very low value of sludge production (0.052 kgVS kgCOD−1) was observed. Oxygen uptake rate (OUR) tests allowed us to exclude the possibility that mesophilic biomass generally exhibited any acute inhibition following contact with the aqueous residues (ARs), except for substrates that presented high concentrations of perfluoro alkyl substances (PFAS), cyanides and chlorides. In one case, nitrifying activity was partially inhibited by high chlorides and PFAS concentration, while in another the substrate determined a positive effect, stimulating the phenomenon of nitrification. Nitrogen uptake rate (NUR) tests highlighted the feasibility of reusing the organic carbon contained in the substrate as a source in denitrification, obtaining a value comparable with that obtained using the reference solution with methanol. Therefore, respirometric tests proved to be a valid tool to assess the acute effect of AR of ThMBR on the activity of mesophilic biomass in the case of recirculation.

Exploitation of Nutrient-Rich Soil Patches by Invasive Annual and Native Perennial Grasses

2010 ◽  
Vol 3 (2) ◽  
pp. 169-177 ◽  
Author(s):  
Jeremy J. James ◽  
L. Ziegenhagen ◽  
Z. T. Aanderud
Keyword(s):  
Nutrient Uptake ◽  
Uptake Rate ◽  
Native Species ◽  
Perennial Grasses ◽  
Nutrient Distribution ◽  
Common Time ◽  
Heterogeneous Soils ◽  
Nitrogen Uptake Rate ◽  
Nutrient Uptake Rate ◽  
Slow Growing

AbstractInvasion of nutrient-poor habitats might be related to the ability of a species to exploit nutrient-rich microsites. Recent research suggests fast-growing species might have a greater ability to allocate root biomass to nutrient-rich microsites (root foraging precision) than slow-growing species. We examined if differences in relative growth rate (RGR) between invasive and native species were related to differences in foraging precision. We hypothesized that invasive species would: (1) have greater foraging precision than native species but (2) greater foraging precision would come at a cost in terms of root nutrient uptake rate. Foraging precision was evaluated on plants growing in soils with uniform or patchy nutrient distribution. Plants were harvested at a common time and a common developmental stage to separate indirect effects of RGR on foraging. Nutrient uptake rate was examined by exposing plants to a low or high nitrogen pulse. Invasives foraged more precisely than natives but had lower nitrogen uptake rate. Although these results support the idea of a positive relationship between RGR and foraging precision, biomass production in heterogeneous soils showed no relationship to foraging precision. Instead, species with greater RGR produced more biomass and root length across all treatments, allowing greater nutrient capture in heterogeneous soils. Although these results do not exclude a role for proliferation in influencing invasion of nutrient-poor systems or the potential for heterogeneity to influence population processes, these results suggest other traits may have an overriding importance in determining invader success in these systems.

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