Ammonia volatilisation losses from urea applied to acidic cropping soils is regulated by pH buffering capacity

Modulation of sheep ruminal urea transport by ammonia and pH.

Ruminal fermentation products such as short-chain fatty acids (SCFA) and CO2 acutely stimulate urea transport across the ruminal epithelium in vivo, whereas ammonia has inhibitory effects. Uptake and signaling pathways remain obscure. The ruminal expression of SLC14a1 (UT-B) was studied using polymerase chain reaction (PCR). The functional short-term effects of ammonia on cytosolic pH (pHi) and...

Urease Activity, Ammonia Volatilisation and Related Microbiological Aspects in Some South African Soils

Urease activity of various soils was indexed employing toluene sterile and non-sterile soils. The two methods indicated that part played by microorganisms. Apparatus used, soil depth, increment, depth of placement and pattern distributions are discussed in relation to volatile loss as are influences of soil moisture, reaction, temperature and drying-out. Urea on trash benefits fungi but invaria...

Autotrophic ammonia oxidation at low pH through urea hydrolysis.

Ammonia oxidation in laboratory liquid batch cultures of autotrophic ammonia oxidizers rarely occurs at pH values less than 7, due to ionization of ammonia and the requirement for ammonium transport rather than diffusion of ammonia. Nevertheless, there is strong evidence for autotrophic nitrification in acid soils, which may be carried out by ammonia oxidizers capable of using urea as a source ...

Efficacy of a novel pH-buffering tampon in preserving the acidic vaginal pH during menstruation.

Salivary pH and Buffering Capacity in Frugivorous and Insectivorous Bats

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