CO 2 Responses of Winter Wheat, Barley and Oat Cultivars under Optimum and Limited Irrigation

Zsuzsanna Farkas, Angéla Anda, Gyula Vida, Ottó Veisz and Balázs Varga
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Zsuzsanna Farkas: Agricultural Institute, Centre for Agricultural Research, Eötvös Loránd Research Network, H-2462 Martonvásár, Hungary
Angéla Anda: Georgikon Campus, IES, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary
Gyula Vida: Agricultural Institute, Centre for Agricultural Research, Eötvös Loránd Research Network, H-2462 Martonvásár, Hungary
Ottó Veisz: Agricultural Institute, Centre for Agricultural Research, Eötvös Loránd Research Network, H-2462 Martonvásár, Hungary
Balázs Varga: Agricultural Institute, Centre for Agricultural Research, Eötvös Loránd Research Network, H-2462 Martonvásár, Hungary

Sustainability, 2021, vol. 13, issue 17, 1-23

Abstract: Field crop production must adapt to the challenges generated by the negative consequences of climate change. Yield loss caused by abiotic stresses could be counterbalanced by increasing atmospheric CO 2 concentration, but C 3 plant species and varieties have significantly different reactions to CO 2 . To examine the responses of wheat, barley and oat varieties to CO 2 enrichment in combination with simulated drought, a model experiment was conducted under controlled environmental conditions. The plants were grown in climate-controlled greenhouse chambers under ambient and enriched (700 ppm and 1000 ppm) CO 2 concentrations. Water shortage was induced by discontinuing the irrigation at BBCH stages 21 and 55. Positive CO 2 responses were determined in barley, but the CO 2 -sink ability was low in oats. Reactions of winter wheat to enriched CO 2 concentration varied greatly in terms of the yield parameters (spike number and grain yield). The water uptake of all wheat cultivars decreased significantly; however at the same time, water-use efficiency improved under 1000 ppm CO 2 . Mv Ikva was not susceptible to CO 2 fertilization, while no consequent CO 2 reactions were observed for Mv Nádor and Mv Nemere. Positive CO 2 responses were determined in Mv Kolompos.

Keywords: winter cereals; CO 2 enrichment; drought stress; WUE; climate change (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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