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Critical Nitrogen Curve and Nitrogen Nutrition Index for Corn in Eastern Canada

^a Agriculture and Agri-Food Canada (AAFC), Soils and Crops Research and Development Centre, 2560 Hochelaga Blvd., Quebec, QC, Canada G1V 2J3
^b AAFC, 430 Gouin Blvd., St-Jean-sur-Richelieu, QC, Canada J3B 3E6
^c Dep. of Soil and Agri-Food Engineering, Laval Univ., Sainte-Foy, QC, Canada G1V 0A6

View larger version (32K): [in this window] [in a new window]   Fig. 1. Changes in N concentration as a function of thermal time (cumulative corn heat units, CHU) of corn fertilized with various N application rates in an experiment conducted at three sites in each of 2 yr (2004 and 2005). Vertical bars represent LSD values (P 0.10) at each sampling date; ND: LSD was not determined. 250s indicates 250 kg N ha–1 applied at planting.

View larger version (14K): [in this window] [in a new window]   Fig. 2. Validation of the critical N curve using data from corn grown under limiting and nonlimiting N growing conditions. Solid line, critical N curve (Nc = 34.0W–0.37) describes the relationship between the critical N concentration and shoot biomass of corn in France (Plénet and Lemaire, 2000); dashed line, critical N curve (Nc = 34.1W–0.391) describes the relationship between the critical N concentration and shoot biomass of corn in Germany (Herrmann and Taube, 2004).

View larger version (32K): [in this window] [in a new window]   Fig. 3. Nitrogen nutrition index (NNI) of corn fertilized with various N application rates in an experiment conducted at three sites in each of 2 yr (2004 and 2005). The NNI is presented for the different sampling dates expressed in cumulative corn heat units (CHU). Vertical bars represent LSD values (P 0.10) at each sampling date; ND: LSD was not determined. 250s indicates 250 kg N ha–1 applied at planting.

View larger version (11K): [in this window] [in a new window]   Fig. 4. Relationship between relative grain yield (RY) and the N nutrition index (NNI) of corn in an experiment conducted at three sites in each of 2 yr (2004 and 2005); data of NNI were averaged over all sampling dates.