A laboratory technique for releasing and measuring denitrification products trapped in soil

Several laboratory denitrification studies have shown an incomplete 15N balance at their conclusion. This incomplete 15N balance could be attributed to trapped gaseous products of denitrification within the soil. Incubation trials were designed to determine whether a complete 15N balance could be ac...

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Bibliographic Details
Published inSoil Science Society of America journal Vol. 52; no. 5
Main Authors Holt, L.S, Christianson, C.B, Austin, E.R, Katyal, J.C
Format Journal Article
LanguageEnglish
Published 01.09.1988
Subjects
DENITRIFICACION
DENITRIFICATION
EQUIPEMENT DE LABORATOIRE
EQUIPO DE LABORATORIO
GASES
GAZ
INVESTIGACION
MEDICION
MESURE
RECHERCHE
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Summary:Several laboratory denitrification studies have shown an incomplete 15N balance at their conclusion. This incomplete 15N balance could be attributed to trapped gaseous products of denitrification within the soil. Incubation trials were designed to determine whether a complete 15N balance could be achieved if these trapped gases were released and included in the 15N balance. At the end of a preliminary incubation trial using flooded soils, 80% of the fertilizer was found in the soil and water fraction while the measured loss through denitrification into the headspace was only 2.6% with 70% in the soil and water fraction. When the incubation vessel was thoroughly shaken prior to sampling, fertilizer N recovery in the gaseous phase increased to 26.7%. This indicated that most of the gaseous products of denitrification had been trapped within the soil, and a nearly complete 15N balance was obtained
Bibliography:P34
8871786
ISSN:0361-5995
1435-0661
DOI:10.2136/sssaj1988.03615995005200050057x