Growth comparisons were made between a microalgal consortium and Scenedesmus sp. cultivated in treated wastewater (TWw) enriched with 1 mL·L–1 Bayfolan Forte fertilizer (BM), TWw (NH4)2HPO4 (PAM), NH4HCO3 (BCAM), tap water piggery (PEM), digestate (PDM), raw (Ww). Nitrogen (N) content the media, except for TWw, was adjusted to 80 mg·L–1 N (NH4+-N NO3–-N). Unconventional low-cost media lower nut...

To identify the production and consumption pathways temporal dynamics of N2O emitted from soil, this study uses 15N-labelled substrate-N to quantify underlying gross N transformation rates using Ntrace analysis tool link them N-emissions. In three experiments twelve soil cores each were incubated in a lab incubation system measure gaseous emissions, while parallel incubations under same conditi...

The century-old trickling filters at the Daspoort Wastewater Treatment Works in Pretoria (Gauteng, South Africa) are known for their remarkable removal of nitrogen from municipal wastewater. Our study was conducted to identify the microbiological processes responsible for this phenomenon and to establish whether anammox bacteria may be involved. An aerobic and anaerobic bench top reactor, both ...

In situ measurements of atmospheric NO3 and NH4 þ at Sandy Hook on the northern New Jersey (USA) coast and at Tuckerton on the southern New Jersey coast reveal significant temporal and spatial variations of these inorganic N constituents. The mean concentration of NO3 in precipitation was higher at Sandy Hook (44.6 lmol/L) than at Tuckerton (29.1 lmol/L). The mean concentration of NH4 þ in prec...

*Correspondence: Patricia M. Glibert, Horn Point Laboratory, University of Maryland Center for Environmental Science, PO Box 775, 2020 Horns Point Rd., Cambridge, MD 21613, USA e-mail: [email protected] The effect of equivalent additions of nitrogen (N, 30–40μM-N) in different forms (ammonium, NH4 , and nitrate, NO − 3 ) under conditions of different light exposure on phytoplankton community co...

Among the mineral nutrient elements, nitrogen is a kind of macronutrient. Most plant species are able to absorb and assimilate nitrate (NO3–), ammonium (NH4+), urea and amino acids as nitrogen sources. Most soils do not have sufficient N in available form to support desired production levels. Therefore, addition of N from fertilizer is typically needed to maximize crop yields. Many kinds of N f...

Intensive management of grass seed fields in the poorly drained soils of the Willamette Valley, Oregon, has prompted concern in the capacity of these landscapes and their associated minimally managed riparian areas to process and retain fertilizer N. Our goal was to determine the extent of N losses and effectiveness of a riparian area and an adjacent perennial ryegrass seed field to retain N. T...

Expression of glutamate metabolism enzymes, glutamate dehydrogenase (GDH), and glutamine synthetase (GS) are proposed to yield information on the nitrogen (N) to carbon (C) metabolic balance within bacterioplankton communities. Whole-cell assay conditions were optimized, and reactions were linear with time and biomass. Enzyme activities were assayed in seawater cultures from four ecosystems of ...

We compared growth kinetics of Prorocentrum donghaiense cultures on different nitrogen (N) compounds including nitrate (NO3 ), ammonium (NH4 ), urea, glutamic acid (glu), dialanine (diala) and cyanate. P. donghaiense exhibited standard Monod-type growth kinetics over a range of N concentraions (0.5–500 mmol N L for NO3 2 and NH4 , 0.5–50 mmol N L for urea, 0.5–100 mmol N L for glu and cyanate, ...

On the basis of mass balance calculations performed for nitrogen (N) uptake experiments in the Southern California Bight (SCB), it has been suggested that a significant portion of dissolved inorganic N (DIN) uptake results in the production of dissolved organic N (DON). To investigate this process, the fate of ammonium (NH4 ) and nitrate (NO3 ) uptake was quantified within the euphotic zone at ...