Some influences of CO2 enrichment, nitrogen nutrition and competition on grain yield and quality in spring wheat and barley
1994
Spring wheat and spring barley were grown in elevated atmospheric CO 2 in controlled environments. Wheat was grown in monoculture and in competition with three weed species. In monoculture, wheat had 30% more grain yield and 28% less grain nitrogen in elevated compared to ambient atmospheric CO 2 . In competition, wheat had no significant increase in yield with elevated atmospheric CO 2 . In competition, grain nitrogen concentration was reduced in response to CO 2 with the largest reduction occurring with the smallest competitor and the smallest reduction occurring with the largest competitor. Spring barley was grown in monoculture at three nitrogen fertilizer supplies
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