Effects of nitrogen fertilization on grain protein content, nitrogen uptake, and nitrogen use efficiency of six spring wheat (Triticum aestivum L.) cultivars, in relation to estimated moisture supply

Gauer, L.E.; Grant, C.A.; Gehl, D.T.; Bailey, L.D.

Canadian Journal of Plant Science 72(1): 235-241


ISSN/ISBN: 0008-4220
DOI: 10.4141/cjps92-026
Accession: 002091936

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Six spring wheat cultivars grown on Black Chernozemic soils in Manitoba in 1985-87 were given 0-200 kg N/ha. Site-years were grouped into high and moderate moisture classes based on estimated soil moisture supply; moderate moisture meant there was some moisture stress later in the season. Moisture supply was positively correlated with grain yield, grain N yield and N use efficiency. Protein concentration was negatively correlated with grain yield and soil moisture. Increasing N rate increased protein concentration and N uptake and decreased N use efficiency; protein concentration only increased at the higher rates, due to large increases in grain yield with the addition of low levels of N. Grain yield with 0 and 120 kg N/ha was 1.70 and 2.59 t/ha, respectively, at moderate soil moisture and 1.64 and 3.12 t at high moisture; there were no further increases at higher rates. Grain yields were highest in cv. HY320 and Marshall at moderate moisture and in HY320 and Solar at high moisture. Cultivar differences varied with soil moisture and N supply.