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Impact of Elevated CO2 on Soil–Plant Phosphorus Dynamics, Growth, and Yield of Chickpea (Cicer arietinum L.) in an Alkaline Vertisol of Central India

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Abstract

The increasing atmospheric [CO2] would alter soil–plant nutrient dynamics depending on crop species, soil type, and climate. Insights on the impacts of the predicted level of elevated [CO2] (e[CO2]) on the soil–plant-environment system are, therefore, important for strategic nutrient management for future environments. The impacts of e[CO2] environment on soil phosphorus (P) bioavailability and soil–plant P dynamics in chickpea are uncertain in tropical alkaline Vertisols. An open-top chamber–based experiment with e[CO2] (570 ± 30 ppmv) and ambient [CO2] treatments aimed to investigate the impacts of e[CO2] on soil–plant P dynamics, physiology, and yield of chickpea in a moderately alkaline Vertisol of subtropical central India. Experimental findings revealed that the e[CO2] treatment increased Olsen P at flowering stage (+ 13%, p < 0.05), water-soluble carbon (11–14%), and KMnO4-C (5–14%) at both branching and flowering stages (p < 0.05). Results demonstrated that the increased mobilization of dissolved non-reactive P (NaHCO3-Po, NaOH-Po) (from branching to flowering) and competitive sorption with higher soluble carbon possibly contributed to the higher available P (Olsen P) under the e[CO2] environment. The e[CO2] treatment had a significant impact on photosynthetic rate (+ 5.3%), stomatal conductance (− 16.5%), and leaf chlorophyll content (+ 5.1%) over the ambient (p < 0.05) but did not alter leaf nitrate reductase activity. The e[CO2] treatment increased plant biomass (+ 25%) and productivity (+ 11.6%), P uptake (+ 16.6%), and physiological P use efficiency (+ 7.1%) (p < 0.05). Thus, it can be concluded that e[CO2] (~ 570 ppmv) could enhance P availability in alkaline Vertisols of subtropical regions favoring P nutrition, physiological activity, and yield of chickpea.

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Acknowledgements

The first author thankfully acknowledges the research support provided by the ICAR–Indian Institute of Soil Science, Bhopal, during his professional training program to carry out this research.

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Correspondence to Asik Dutta.

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The authors declare no competing interests.

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Dutta, A., Lenka, N.K., Praharaj, C.S. et al. Impact of Elevated CO2 on Soil–Plant Phosphorus Dynamics, Growth, and Yield of Chickpea (Cicer arietinum L.) in an Alkaline Vertisol of Central India. J Soil Sci Plant Nutr 22, 1904–1914 (2022). https://doi.org/10.1007/s42729-022-00781-4

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  • DOI: https://doi.org/10.1007/s42729-022-00781-4

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