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Titolo:
Relationship between rate of crop growth at date of fertiliser N application and fate of fertiliser N applied to winter wheat
Autore:
Limaux, F; Recous, S; Meynard, JM; Guckert, A;
Indirizzi:
Chambre Reg Agr Lorraine, F-54524 Laxou, France Chambre Reg Agr Lorraine Laxou France F-54524 ine, F-54524 Laxou, France INRA, Unite Agron, F-02007 Laon, France INRA Laon France F-02007INRA, Unite Agron, F-02007 Laon, France INRA, INA PG, Unite Agron, F-78850 Thiverval Grignon, France INRA Thiverval Grignon France F-78850 F-78850 Thiverval Grignon, France ENSAIA, Unite Agron & Environm, F-54505 Vandoeuvre Nancy, France ENSAIA Vandoeuvre Nancy France F-54505 F-54505 Vandoeuvre Nancy, France
Titolo Testata:
PLANT AND SOIL
fascicolo: 1-2, volume: 214, anno: 1999,
pagine: 49 - 59
SICI:
0032-079X(1999)214:1-2<49:RBROCG>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
LABELED N-15 UREA; AMMONIA VOLATILIZATION; SOIL; NITROGEN; NITRATE; RECOVERY;
Keywords:
date of application; fertiliser; growth rate; N uptake efficiency; (15) N; winter wheat;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Limaux, F INRA, Unite Agron, Rue Fernand Christ, F-02007 Laon, France INRARue Fernand Christ Laon France F-02007 -02007 Laon, France
Citazione:
F. Limaux et al., "Relationship between rate of crop growth at date of fertiliser N application and fate of fertiliser N applied to winter wheat", PLANT SOIL, 214(1-2), 1999, pp. 49-59

Abstract

To investigate the relationship between the timing of fertiliser N applications and the N use efficiency of wheat, three field experiments with N-15 were set up on winter wheat, on three different soils in France. Different crop N demands on the day of fertiliser application were obtained by varying either crop densities or date of fertiliser application. Labelled (NH4NO3)-N-15-N-15 was applied at tillering and during stem elongation. The N-15 recovered from plant and soil at different dates after N-15 addition and at maturity of wheat was measured. The fate of fertiliser N was rapidly determined, most of the fertiliser N accumulated in the wheat at maturity having been taken up within a few days of application. N-15 recovery by the crop at final harvest (%) varied greatly (19-55% N applied) according to crop density, soil type and date of application. It was linearly related to the instantaneous crop growth rate calculated at the day of N-15 application. The amount of fertiliser N immobilised in the soil was constant at 20 kg N ha(-1), for all soil types and crop densities. Because residual mineral N-15 inthe soil at harvest was negligible and immobilisation was constant, the level of total N-15 measured in the different N pools (soil+plant) reflected the% N-15 uptake by the plant. There was consequently a negative linear relationship between the percentage of N-15 not recovered for measurement, andcrop growth rate (i.e. crop N demand) at date of fertiliser application. These results suggest that crop N demand at the time of N application determines the ability of the crop to compete for N with other processes, and maybe a major factor determining the division of N between soil and crop.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 06:46:57