The magnitude of both effects and the extent to which they change growth, yield, and water requirements of crops is likely to be influenced by other environmental factors such as soil nitrogen supply. The elevated levels of CO2 affect plant photosynthesis and also cause a partial closure of the stomata in plant leaves through which the plant exchanges CO2 and water vapor with the atmosphere. Interpretive Summary: The CO2 concentration in the atmosphere is increasing and expected to double near the end of this century. Simulated wheat growth affected by rising temperature, increased water deficit and elevated atmospheric CO2. Citation: Asseng, S., Jamieson, P.D., Kimball, B.A., Pinter Jr, P.J., Sayre, K., Bowden, J.W., Howden, S.M.
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