Carbon dioxide and/or temperature elevation effect on yield response, nutrient partitioning and use efficiency of applied nitrogen in wheat crop in central India

• Published in: Field crops research 2021-05, Vol.264, p.108084, Article 108084
• Main Authors: Lenka, Narendra K., Lenka, Sangeeta, Yashona, Dharmendra Singh, Shukla, Arvind Kumar, Elanchezhian, R., Dey, Pradip, Agrawal, Pawan Kumar, Biswas, Ashish K., Patra, Ashok Kumar
• Format: Article
• Language: English
• Subjects: Climate change impact on soil nutrient pool; CO2 fertilization; Nitrogen mining from soil; Open top chamber; Plant nitrogen uptake
• ISSN: 0378-4290; 1872-6852
• DOI: 10.1016/j.fcr.2021.108084

•CO2 elevation enhanced agronomic, physiological and recovery efficiency of applied N.•Effect got reduced with co-elevation of temperature.•Three years’ pooled data showed 15% yield advantage under CO2 elevation.•CO2 fertilization at the cost of higher N uptake and depleting soil N over time.•Soil N availability is likely the key factor for harnessing CO2 fertilization benefits. Despite several implications of excessive nitrogen (N) use on environment, information on effect of elevated carbon dioxide (CO2) and/or temperature on recovery and use efficiency of applied N are limited. Hence, this field study was carried out for three consecutive seasons of wheat crop during 2016−17 to 2018−19 in Open Top Field chambers (OTCs) under four climate conditions, viz. ambient, elevated CO2 (∼550 μmol mol−1), elevated temperature (∼ 2.0 °C above ambient) and co-elevation of both CO2 and temperature. Interaction of climate and year was found non-significant (P > 0.05) for the studied parameters, but, significant effect of climate was observed in most of the parameters except straw N uptake. Pooled data analysis of three consecutive crop years indicated CO2 elevation significantly enhancing above ground biomass and grain yield and also N uptake in grain. The CO2 mediated grain yield response was to the extent of 15% (P