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Effect of Planting System and Elevated CO2 Environment on Soil NH4+–N and NO3–N Content and Yield of Hybrid Rice in Subtropical India

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Abstract

A comparative study on the effect of elevated CO2 environment on soil nitrogen availability in different rice planting system is needed to develop nutrient management strategies in future climate scenarios. A field experiment was conducted inside open top chambers (OTC) to study the effect of elevated CO2 environment with varying nitrogen management on soil NH4+–N and NO3–N status in two planting system of rice, direct-seeded rice (DSR) and puddled transplanted rice (PTR). The nitrogen management included chemical fertilizer (CF) at 100% (CF100) and 150% (CF150) of the recommended dose, integrated nitrogen management including organic fertilizer (OF) and CF as CF75+ OF75, and site-specific N management through CF using SPAD meter. The soil NH4+–N content was higher in PTR, but NO3–N was higher in DSR. The soil NH4+–N and NO3–N content decreased significantly under elevated CO2 environment as compared to ambient in both planting system, except the NO3–N content at flowering in DSR. The decrease was around 8% for NH4+–N and 5% for NO3–N content. Soil nitrogen content in DSR can be maintained by following integrated nutrient management (CF75 + OF75) and SPAD-based nitrogen management for sustainable yield. Grain yield, in general, increased with CO2 elevation in both planting system. Under ambient environment, CF150 increased the grain yield by 23% as compared to CF100 in DSR, but no change was noted in PTR. However, under elevated CO2 environment, CF150 increased the grain yield by 13% in PTR. Under elevated CO2 environment, the yield increase of the hybrid rice to additional N fertilizer application was noted in PTR but not in DSR. This study suggests that for sustainable rice production under increasing CO2 environment in future climate scenarios, higher dose of N fertilizer is recommended in PTR, but normal dose in DSR production system.

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Acknowledgements

This work was supported through Food Security Research project by the Department of Higher Education, Ministry of Human Resource Development, Government of India.

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Correspondence to Dillip Kumar Swain.

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The authors declare no conflict of interest regarding the publication of this work.

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Singh, P., Swain, D.K., Bhadoria, P.B.S. et al. Effect of Planting System and Elevated CO2 Environment on Soil NH4+–N and NO3–N Content and Yield of Hybrid Rice in Subtropical India. Int. J. Plant Prod. 13, 141–153 (2019). https://doi.org/10.1007/s42106-019-00039-7

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  • DOI: https://doi.org/10.1007/s42106-019-00039-7

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