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Nitrogen Effects on Grain Yield and Yield Components of Leafy and Nonleafy Maize Genotypes

^a Univ. of Passo Fundo, Passo Fundo, RS 99001-970, Brazil
^b Dep. of Plant Science, McGill Univ., Macdonald Campus, 21,111 Lakeshore, Ste-Anne-de-Bellevue, QC, H9X 3V9 Canada
^c Agriculture and Agri-Food Canada, Eastern Cereal and Oilseed Research Centre, Ottawa, ON, K1A OC6 Canada

View larger version (20K): [in a new window]   Fig. 1. Examples of plant canopy architectures of field-grown maize genotypes at silking stage.

View larger version (35K): [in a new window]   Fig. 2. Monthly mean temperature and total rainfall during the 1996 and 1997 growing seasons and 30-yr mean at the Macdonald and the Ottawa experimental sites.

View larger version (19K): [in a new window]   Fig. 3. Effect of N fertilization rate on ear diameter and on ear length for data pooled across six maize genotypes grown at the Macdonald and Ottawa sites in 1996 and 1997.

View larger version (74K): [in a new window]   Fig. 4. Examples of ears of six contrasting maize genotypes grown at the Macdonald site in 1997.

View larger version (42K): [in a new window]   Fig. 5. Relative contribution of top and bottom kernels and cob to the total diameter of the ear of maize hybrids grown at the Macdonald site in 1997.

View larger version (14K): [in a new window]   Fig. 6. Regression relationships between applied N rates and mean grain yield from data pooled across genotypes and years within sites. Macdonald: GY = 8.62N + 7960.32; r2 = 0.99, P < 0.01. Ottawa: GY = -0.143N2 + 44.49N + 8654.03; r2 = 0.85, P < 0.01.