Registro Completo |
Biblioteca(s): |
Embrapa Meio Norte / UEP-Parnaíba. |
Data corrente: |
31/03/1998 |
Data da última atualização: |
31/03/1998 |
Autoria: |
JENKINSON, D. S.; FOX, R. H.; RAYNER, J. H. |
Título: |
Interactions between fertilizer nitrogen and soil nitrogen - the so-called 'priming' effect. |
Ano de publicação: |
1985 |
Fonte/Imprenta: |
Journal of Soil Science, v.36, p.425-444, 1985. |
Idioma: |
Inglês |
Conteúdo: |
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Palavras-Chave: |
Fertilizer nitrogen; Interacao; Interactions; Nitrogenio do solo; Soil nitrogen. |
Thesagro: |
Fertilizante Nitrogenado. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02302naa a2200217 a 4500 001 1079163 005 1998-03-31 008 1985 bl --- 0-- u #d 100 1 $aJENKINSON, D. S. 245 $aInteractions between fertilizer nitrogen and soil nitrogen - the so-called 'priming' effect. 260 $c1985 520 $a<Experiments with l5N labelled fertilizers often show that plants given fertilizer N take up more N from the soi than plants not geiven N - the priming effect or 'added nitrogen interaction' (ANI). This paper is a theoretical study of ANIs and how they can affect the interpretation of experiments with 15N labelled fertilizers. ANIs can be 'real' , if for example, fertilizer N increases the volume of soil explored by roots, or 'apparent', caused by pool substitution or by isotope displacement reactions. Pool substitution is the process by which added labelled N stands proxy for native unlabelled N that would otherwise have been removed from that pool. Microbial immobilization of N, whether driven by the decomposition of soil organic matter or by the decomposition of plant roots, can lead to pool substitution and is the dominant cause of apparent ANIs. Denitrification and plant uptake of N can also, under special circumstances, lead to pool substitution and thus give rise to apparent ANIs. Isotope displacement reactions, in which the added labelled N displaces native unlabelled N from a 'boundï pool, can lead to apparent ANIs but are only likely to be of significance in exceptional circunstances. The relationship between ANIs, 'A' values and N fertilizer uptake efficiencies are examined by means of a simplemodel for uptake of 15N-labelled fertilizer by a crop. A positive 'apparent' ANI is accompanied by an 'A' value that changes as fertilizer applications increase, Likewise, a positive 'apparent' ANI also causes fertilizer uptake efficiency to appear lower when measured by the uptake of 15N than when measured by the non-isotopic 'difference' method. 650 $aFertilizante Nitrogenado 653 $aFertilizer nitrogen 653 $aInteracao 653 $aInteractions 653 $aNitrogenio do solo 653 $aSoil nitrogen 700 1 $aFOX, R. H. 700 1 $aRAYNER, J. H. 773 $tJournal of Soil Science$gv.36, p.425-444, 1985.
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Registro original: |
Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP) |
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