Journal article

Publication year: 1996

Pages: 12-18

Journal: Journal of applied botany = Angewandte Botanik

Volume number: 70

Issue number: 1-2

ISSN: 0066-1759

Publisher: Blackwell

Abstract: 
Two cultivars of spring wheat (Triticum aestivum L. cv. 'Nandu' and cv. 'Minaret') and one cultivar of spring barley (Hordeum vulgare L. cv. 'Alexis') were exposed to CO2 enrichment (concentrations ranging from 363 to 650 mu l l(-1)), ozone (ambient and 1.7 times ambient levels) at different levels of nitrogen nutrition in open-top field chambers from sowing to maturity. CO2 increased grain yield and shoot biomass, barley showing the smallest response and wheat 'Nandu' being most responsive. The cultivars were rather insensitive to ozone, however, a decrease of thousand grain weight was observed in one of the wheat cultivars ('Minaret') at high ozone levels. In this cultivar, interactions between CO2 and ozone were observed. Elevated CO2 appeared to be protective against impairments caused by ozone. CO2 and nitrogen supply strongly interacted. CO2 fertilizing effects on grain yield of wheat 'Minaret' ranged from 22.9 % at 120 kg N ha(-1) to 47.4 % at 330 kg N ha(-1). Increase in grain yield by CO2 was accompanied with a decrease of grain nitrogen content. Grain yield increase and grain nitrogen content depression exactly compensated each other and led to constant amounts of nitrogen stored in the grains on an area unit basis independent from the applied CO2 concentration. The grain quality, assessed as nitrogen content, was severely decreased by CO2 enrichment. The regressions obtained from the data suggest that nearly twice the nitrogen supply will be required to maintain the nitrogen content in grains at the same level if CO2 concentrations rise from the current 363 mu l l(-1) (seasonal mean 1994) to 650 mu l l(-1).

Harvard Citation style: Fangmeier, A., Gruters, U., Vermehren, B. and Jäger, H. (1996) Responses of some cereal cultivars to CO2 enrichment and tropospheric ozone at different levels of nitrogen supply, Journal of applied botany = Angewandte Botanik, 70(1-2), pp. 12-18

APA Citation style: Fangmeier, A., Gruters, U., Vermehren, B., & Jäger, H. (1996). Responses of some cereal cultivars to CO2 enrichment and tropospheric ozone at different levels of nitrogen supply. Journal of applied botany = Angewandte Botanik. 70(1-2), 12-18.