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Titolo:
Ability of the SUNDIAL model to simulate the short-term dynamics of N-15 applied to winter wheat and oilseed rape
Autore:
Gabrielle, B; Recous, S; Tuck, G; Bradbury, NJ; Nicolardot, B;
Indirizzi:
INRA, Unite Mixte Rech Environm & Grandes Cultures, F-78850 Thiverval Grignon, France INRA Thiverval Grignon France F-78850 F-78850 Thiverval Grignon, France INRA, Unite Agron, Laon, France INRA Laon FranceINRA, Unite Agron, Laon, France AFRC, Inst Arable Crops Res, Dept Soil Sci, Harpenden AL5 2JQ, Herts, England AFRC Harpenden Herts England AL5 2JQ i, Harpenden AL5 2JQ, Herts, England INRA, Unite Agron Chalons Reims, Reims, France INRA Reims FranceINRA, Unite Agron Chalons Reims, Reims, France
Titolo Testata:
JOURNAL OF AGRICULTURAL SCIENCE
, volume: 137, anno: 2001,
parte:, 2
pagine: 157 - 168
SICI:
0021-8596(200109)137:<157:AOTSMT>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROGEN DILUTION CURVE; N-15-LABELED FERTILIZER; SOIL; NITRATE; FATE; CROP; WATER; TRANSFORMATIONS; MANAGEMENT; RECOVERY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Gabrielle, B INRA, Unite Mixte Rech Environm & Grandes Cultures, F-78850 Thiverval Grignon, France INRA Thiverval Grignon France F-78850 erval Grignon, France
Citazione:
B. Gabrielle et al., "Ability of the SUNDIAL model to simulate the short-term dynamics of N-15 applied to winter wheat and oilseed rape", J AGR SCI, 137, 2001, pp. 157-168

Abstract

Labelling using the stable 15 isotope of nitrogen allows a close monitoring of the fate of the fertilizer applied to arable crops. Because N-15 data give direct estimates of nitrogen transformation rates, they also provide more stringent tests for N models than those based on bulk inorganic N dynamics. They may therefore point at flaws in models that had previously gone unnoticed, especially if N-15 was monitored on short time steps which capture even rapid processes like nitrification. Here we tested the simple, process-based model SUNDIAL on two such data sets obtained in Northern France under winter wheat and winter rape crops receiving various doses and forms of fertilizer N. In both experiments, microplots (approximate to 1 ml in size) within larger blocks were dressed with 2.0 atom-% enriched labelled N-15, as urea, or ammonium-nitrate as NH4+-(NO3-)-N-15 or (NH4+)-N-15-NO3-. Replicate micro-plots were subsequently sampled on four occasions after fertilizer application, and N-15 enrichment was monitored in plant roots and tops, and at several depths in the soil in inorganic and organic forms. Comparison between observed and simulated data showed that, shortly after application, SUNDIAL either underestimated (rapeseed) or overestimated (wheat) the rates of crop uptake, Also, the gradual incorporation of N-15 into soil organic matter was too quick in autumn and too slow in spring under the rapeseed crop. The simulation of the rapid depletion of the labelled soilinorganic N pool was correct under wheat, whereas under rape, SUNDIAL predicted an accumulation of nitrate which was not observed. After a longer time interval (1-2 months), the simulated and observed amounts of fertilizer-derived N in the crop and in the soil became more comparable. However, SUNDIAL only accounted for part of the unrecovered labelled N. Additional measurements indicated that denitrification and ammonia volatilization were responsible for most of the losses, with discrepancies occurring because SUNDIAL failed to volatilize ammonia after fertilizer spreading. The other major source of error lay in the simulation of crop demand for nitrogen, which may be improved based on sounder ecophysiological concepts,such as that of a regulation of plant uptake by shoot biomass.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 12:14:53