• Some O horizons showed higher nitrification rate than mineral horizons. Both total N and pH were positively correlated with in horizon. Nutrient richness litters supported active Nitrification horizon increased along a threshold of 5.5–6.0. High nitrate leaching has been observed from the some tropical forests; however, drivers high production (active nitrification) these have not yet identif...

Urethanes have marked physiological activity in plants and animals. Lefevre (1939) found that phenyl urethane affects wheat germination, and subsequently Templeman and Sexton (1946) showed that a variety of urethanes suppress the germination of wheat and oats without affecting charlock. The most active urethanes (for example, isopropylphenylcarbamate;ethylphenylcarbamate) are effective at a con...

Marshall, K. C. (Cornell University, Ithaca, N. Y.) and M. Alexander. Nitrification by Aspergillus flavus. J. Bacteriol. 83:572-578. 1962.-Aspergillus flavus has been shown to produce bound hydroxylamine, nitrite, and nitrate when grown in peptone, amino acid, or buffered ammonium media. Free hydroxylamine was not detected in these cultures, but it was found in an unbuffered ammonium medium in ...

Completely autotrophic nitrogen removal over nitrite (CANON) process was employed in an 18 L sequencing batch reactor (SBR) for treatment of optoelectronic industrial wastewater containing high strength ammonium nitrogen (3712 ± 120 mg NH4(+) - N L(-1)). About 89% of total nitrogen and 98% of NH4(+) - N removal efficiencies were observed at the loading rate of 909 g N m(-3) d(-1) and the HRT of...

Nitrogen (N) saturation is an environmental concern for forests in the eastern U.S. Although several watersheds of the Fernow Experimental Forest (FEF), West Virginia exhibit symptoms of N saturation, many watersheds display a high degree of spatial variability in soil N processing. This study examined the effects of temperature on net N mineralization and nitrification in N-saturated soils fro...

Soil surface electrochemical properties may have a strong influence on nitrifying microorganisms, Hþ and NH4 þ activities, and therefore on the nitrification process. A gradient of surface electrochemical parameters was obtained by amendment of a subtropical acid pine soil (Oxisol) with 0% (control), 3%, 5%, 8%, 10% and 12% pure Ca-Montmorillonite by weight. The Hþ and NH4þ activities, the abun...

The greater Agulhas Current region is an important component of the climate system, yet its influence on carbon and nutrient cycling poorly understood. Here, we use nitrate isotopes (δ15N, δ18O, Δ(15–18) = δ15N–δ18O) to trace regional water mass circulation investigate nitrogen in adjacent recirculating waters. deep intermediate waters record processes occurring remotely, including partial assi...

Urine has great potential to be an effective fertilizer due its high nutrient content, however, it can contain potentially worrying pharmaceuticals. Our objective was study whether urine storage and aerobic biological treatment, i.e. nitrification, sufficient remove pharmaceuticals or additional treatment with activated carbon necessary produce a from urine. We investigated the abatement of twe...