The effects of elevated carbon dioxide, temperature and soil moisture on the water use of stands of groundnut (Arachis hypogaeaL.)
- 1 November 1994
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Experimental Botany
- Vol. 45 (11) , 1633-1638
- https://doi.org/10.1093/jxb/45.11.1633
Abstract
Stands of groundnut (Arachis hypogaea L. cv. Kadiri 3) were grown in controlled environment glasshouses at two mean air temperatures (28 °C and 32 °C), two atmospheric CO2 concentrations (375 ppmv and 700 ppmv) and two soil moisture treatments (irrigated weekly to field capacity or allowed to dry from 22 d after sowing). The transpiration equivalent, Ωw (g kPa kg−1) the product of the accumulated bio-mass/transpired water ratio and the saturation deficit—was calculated for all the treatments using above-ground harvest, root core and neutron probe measurements. Neither temperature nor soil moisture treatment was found to have an effect on Ωw Increased CO2 concentration raised Ωw from 6.21 ±0.30 to 7.67 ±0.29 g kPa kg−1, an increase of 24%(Pw was highlighted.Keywords
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