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Titolo:
Short-term immobilisation and crop uptake of fertiliser nitrogen applied to winter wheat: effect of date of application in spring
Autore:
Recous, S; Machet, JM;
Indirizzi:
INRA, Unite Agron, F-02007 Laon, France INRA Laon France F-02007INRA, Unite Agron, F-02007 Laon, France
Titolo Testata:
PLANT AND SOIL
fascicolo: 2, volume: 206, anno: 1998,
pagine: 137 - 149
SICI:
0032-079X(1998)206:2<137:SIACUO>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
N-15-LABELLED AMMONIUM-NITRATE; LABELED N-15 UREA; SOIL EXTRACTS; FATE; FIELD; BARLEY; GROWTH; IMMOBILIZATION; DECOMPOSITION; EFFICIENCY;
Keywords:
fertilisation; microbial immobilisation; N nutrition; N-15; timing; winter wheat;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Recous, S INRA, Unite Agron, Rue Fernand Christ, F-02007 Laon, France INRARue Fernand Christ Laon France F-02007 -02007 Laon, France
Citazione:
S. Recous e J.M. Machet, "Short-term immobilisation and crop uptake of fertiliser nitrogen applied to winter wheat: effect of date of application in spring", PLANT SOIL, 206(2), 1998, pp. 137-149

Abstract

Previous studies on the fate of fertiliser nitrogen applied to winter wheat in temperate climates have shown that nitrogen (N) applied early, at tillering for wheat, was less efficiently taken up than N applied later in the growth cycle. We examined the extent to which the soil microbial N immobilisation varied during the wheat spring growth cycle and how microbial immobilisation and plant uptake competed for nitrogen. We set up a pulse-N-15 labelled field experiment in which N was applied at eight development stages from tillering (beginning of March) to anthesis (mid-June). Each applicationwas 50 kg N ha(-1) as N-15 labelled urea except for the first application which was 25 kg N ha(-1). The distribution of fertiliser N-15 in shoots, roots, mineral and organic soil N was examined by destructive sampling 7 and 14 days after each N-15 pulse. The inorganic N-15 pool was almost depleted by day 14. The N uptake efficiency increased with later applications from 45% at tillering to 65% at flowering. N immobilisation was rather constant at 13-16% of N applied, whatever the date of application. The increase in plant N-15 uptake resulted in an increase in the total N-15 recovery in the plant-soil system (N-15 in soil + N-15 in plant), suggesting that gaseous losses were lower at the later application dates.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 07:03:29