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Growth and yield of winter wheat (Triticum aestivum) crops in response to CO2 and temperature

Published online by Cambridge University Press:  27 March 2009

T. R. Wheeler ,
G. R. Batts ,
R. H. Ellis ,
P. Hadley  and
J. I. L. Morison
T. R. Wheeler
Affiliation:
Departments of AgricultureThe University of Reading, Earley Gate, Reading RG6 6AT, UK MeteorologyThe University of Reading, Earley Gate, Reading RG6 6AT, UK Horticulture, The University of Reading, Earley Gate, Reading RG6 6AT, UK
G. R. Batts
Affiliation:
Departments of AgricultureThe University of Reading, Earley Gate, Reading RG6 6AT, UK MeteorologyThe University of Reading, Earley Gate, Reading RG6 6AT, UK Horticulture, The University of Reading, Earley Gate, Reading RG6 6AT, UK
R. H. Ellis
Affiliation:
Departments of AgricultureThe University of Reading, Earley Gate, Reading RG6 6AT, UK
P. Hadley
Affiliation:
Horticulture, The University of Reading, Earley Gate, Reading RG6 6AT, UK
J. I. L. Morison
Affiliation:
MeteorologyThe University of Reading, Earley Gate, Reading RG6 6AT, UK
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Summary

Crops of winter wheat (Triticum aestivum L. cv. Hereward) were grown within temperature gradient tunnels at a range of temperatures at either c. 350 or 700 μmol mol−1 CO2 in 1991/92 and 1992/93 at Reading, UK. At terminal spikelet stage, leaf area was 45% greater at elevated CO2 in the first year due to more tillers, and was 30% greater in the second year due to larger leaf areas on the primary tillers. At harvest maturity, total crop biomass was negatively related to mean seasonal temperature within each year and CO2 treatment, due principally to shorter crop durations at the warmer temperatures. Biomass was 6–31% greater at elevated compared with normal CO2 and was also affected by a positive interaction between temperature and CO2 in the first year only. Seed yield per unit area was greater at cooler temperatures and at elevated CO2 concentrations. A 7–44% greater seed dry weight at elevated CO2 in the first year was due to more ears per unit area and heavier grains. In the following year, mean seed dry weight was increased by > 72% at elevated CO2, because grain numbers per ear did not decline with an increase in temperature at elevated CO2. Grain numbers were reduced by temperatures > 31 °C immediately before anthesis at normal atmospheric CO2 in 1992/93, and at both CO2 concentrations in 1991/92. To quantify the impact of future climates of elevated CO2 concentrations and warmer temperatures on wheat yields, consideration of both interactions between CO2 and mean seasonal temperature, and possible effects of instantaneous temperatures on yield components at different CO2 concentrations are required. Nevertheless, the results obtained suggest that the benefits to winter wheat grain yield from CO2 doubling are offset by an increase in mean seasonal temperature of only 1·0 °C to 1·8 °C in the UK.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 127 , Issue 1 , August 1996 , pp. 37 - 48
Copyright
Copyright © Cambridge University Press 1996

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