Synergistic effects of elevated CO2 and high temperature on productivity, plant and soil nitrogen in chickpea (Cicer arietinum) varieties

BIDISHA  CHAKRABARTI; SUDHA  KANNOJIYA; MATHIYARASI K; ARTI  BHATIA; A  SHARMA; V  KUMAR; R C  HARIT

doi:10.56093/ijas.v96i4.166367

Authors

BIDISHA CHAKRABARTI ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
SUDHA KANNOJIYA ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
MATHIYARASI K ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
ARTI BHATIA ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
A SHARMA ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
V KUMAR ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
R C HARIT ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India

https://doi.org/10.56093/ijas.v96i4.166367

Keywords:

Leaf area index, Seed nitrogen uptake, Temperature gradient tunnels

Abstract

An experiment was conducted in temperature gradient tunnels (TGTs) under elevated CO2 and temperature levels to evaluate their interactive effects on growth, yield, plant nitrogen, and soil nitrogen in chickpea (Cicer arietinum L.) varieties during winter (rabi) season of 2020–21 and 2021–22 at ICAR-Indian Agricultural Research Institute, New Delhi. Both desi (BG 372) and kabuli (Pusa 5023) varieties were exposed to temperature rise of 1.1℃ and 3.0℃ while elevated CO2 concentration was around 550 ppm. Temperature rise by 3℃ significantly reduced LAImax of both the varieties. Temperature rise by 1.1℃ did not have any effect on seed yield, but 3℃ temperature rise significantly reduced seed yield in both the chickpea varieties. Yield reduction in kabuli chickpea was more than in 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 increased in chickpea due to the beneficial effect of higher CO2 concentration.

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