Synergistic effects of elevated CO2 and high temperature on productivity, plant and soil nitrogen in chickpea (Cicer arietinum) varieties
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Keywords:
Chickpea, Elevated CO2, High temperatureAbstract
A two-year experiment was conducted in temperature gradient tunnels (TGTs) under elevated CO₂ and temperature levels in a completely randomized design (CRD) to evaluate their interactive effects on growth, yield, plant nitrogen and soil nitrogen in chickpea (Cicer arietinum L.) varieties. Both desi (‘BG 372’) and kabuli (‘Pusa 5023’) varieties were exposed to temperature rise of 1.1⁰C and 3.0⁰C while elevated CO2 concentration was around 550 ppm. Temperature rise by 3⁰C significantly reduced LAImax of both the varieties. Temperature rise by 1.1⁰C did not have any effect on seed yield, but 3⁰C temperature rise significantly reduced seed yield in both the chickpea varieties. Yield reduction in kabuli chickpea was more than the desi variety. In elevated CO2 plus high temperature treatment, reduction in seed N uptake due to temperature rise got compensated by 9.7–15.9% in ‘BG 372’ variety and by 11.4–11.6% in ‘Pusa 5023’ variety. Elevated CO2 partly mitigated the negative effects of temperature on chickpea yield. Seed N concentration as well as soil available N increased under elevated CO2 condition, which is attributed to the fact that, chickpea being a leguminous crop can fix more atmospheric N2 under elevated CO2 condition. This suggests that, although, high temperature alone reduces yield, plant and soil nitrogen, but when combined with elevated CO2, yield and nitrogen levels increase in chickpea due to the beneficial effect of higher CO2 concentration.
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