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Titre du document / Document title

Relationship between P and N concentrations in corn

Auteur(s) / Author(s)

ZIADI Noura (1) ; BELANGER Gilles (1) ; CAMBOURIS Athyna N. (1) ; TREMBLAY Nicolas (2) ; NOLIN Michel C. (1) ; CLAESSENS Annie (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Agriculture and Agri-Food Canada (AAFC), Soils and Crops Research and Development Centre, 2560 Hochelaga Blvd, Quebec, QC, GIV 2J3, CANADA
(2) AAFC, 430 Gouin Blvd, St-Jean-sur-Richelieu, QC, J3B 3E6, CANADA

Résumé / Abstract

Tools to diagnose P crop status are becoming increasingly important to minimize the risk of surface and groundwater contamination from excessive fertilization while still applying sufficient P to optimize crop yield. The objectives of this study were to establish the relationship between P and N concentrations of corn (Zea mays L.) during the growing season and, in particular, to determine the critical P concentration required to diagnose P deficiency. Shoot biomass and P and N concentrations were determined weekly in an experiment with four to six N rates conducted over 2 yr (2004 and 2005) at three sites with adequate soil P for growth. The P and N concentrations decreased with time and increasing shoot biomass at all sites. The P concentration in relation to N under nonlimiting N conditions is described by a linear relationship (P = 1.00 + 0.094N, R2 = 0.76, P < 0.001, n = 71) in which the concentrations are expressed in g kg-1 dry matter (DM). Under limiting N conditions, the relationship was different with greater P concentrations for a given N concentration. The present study establishes a predictive model for critical P concentration in corn shoots, as a function of the N concentration in the shoot biomass and the degree of N deficiency. This critical P concentration can then be used to quantify the degree of P deficiency during the current growing season.

Revue / Journal Title

Agronomy journal    ISSN  0002-1962   CODEN AGJOAT 

Source / Source

2007, vol. 99, no3, pp. 833-841 [9 page(s) (article)] (1 p.)

Langue / Language

Anglais

Editeur / Publisher

American Society of Agronomy, Madison, WI, ETATS-UNIS  (1949) (Revue)

Mots-clés anglais / English Keywords

Group VA element

;

Non metal

;

Phosphorus

;

Nitrogen

;

Agronomy

;

Concentration

;

Mots-clés français / French Keywords

Elément groupe VA

;

Non métal

;

Phosphore

;

Azote

;

Agronomie

;

Concentration

;

Mots-clés espagnols / Spanish Keywords

Elemento grupo VA

;

No metal

;

Fósforo

;

Nitrógeno

;

Agronomía

;

Concentración

;

Localisation / Location

INIST-CNRS, Cote INIST : 553, 35400016224967.0300

Nº notice refdoc (ud4) : 18772273



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