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This article in AJ

  1. Vol. 101 No. 4, p. 947-957
     
    Received: Nov 7, 2008
    Published: July, 2009


    * Corresponding author(s): noura.ziadi@agr.gc.ca
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doi:10.2134/agronj2008.0172x

Leaf Nitrogen Concentration as an Indicator of Corn Nitrogen Status

  1. Noura Ziadi *a,
  2. Gilles Bélangera,
  3. François Gastalc,
  4. Annie Claessensa,
  5. Gilles Lemairec and
  6. Nicolas Tremblayb
  1. a Agriculture and Agri-Food Canada (AAFC), Soils and Crops Research and Development Centre, 2560 Hochelaga Blvd., Québec, QC, Canada G1V 2J3
    c INRA, Unité de Recherche Pluridisciplinaire Prairies et Plantes Fourragères, BP 6, 86600 Lusignan, France
    b AAFC, 430 Gouin Blvd., St-Jean-sur-Richelieu, QC, Canada J3B 3E6

Abstract

Plant-based measurements can be used to diagnose the in-season N status of corn (Zea mays L.). Our objective was to assess the relationship between the corn nitrogen nutrition index (NNI), an index based on whole plant N concentration, and leaf nitrogen concentration of the uppermost collared leaf expressed on the basis of dry matter (DM; NL) or area (NLA). Three to seven N fertilization treatments were used in this study conducted at eight site-years in Canada and two site-years in France. Leaf N concentrations were measured from the uppermost collared leaf on three to five sampling dates along with NNI determinations. At all sites and most sampling dates, NL, NLA, and NNI increased with increasing N rates. With data from all sampling dates, NL and NLA were related to NNI, but the intercept of the response curves varied with site-year. These site-specific relationships should be used with caution for the in-season evaluation of corn N status. At stage of development ∼V12, however, NL was strongly related to NNI (NNI = −0.035 + 0.028 NL; R 2 = 0.82) and the response curve was not affected by site, year, nor cultural practice; NLA was also related to NNI, but the intercept of the response curve varied with site-year. Determining N concentration (DM basis) of the uppermost collared leaf at, or near, the V12 stage of development is an alternate method for assessing NNI, hence eliminating the need to measure shoot biomass.

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Copyright © 2009. American Society of AgronomyCopyright © 2009 by the American Society of Agronomy