Growth and nitrogen allocation of dry season tropical rice as a result of carbon dioxide fertilization and elevated night time temperature
2015
Roy, K. S. | Bhattacharyya, P. | Nayak, A. K. | Sharma, S. G. | Uprety, D. C.
A field experiment was laid out on carbon dioxide (CO₂) fertilization for 3 years in dry cropping seasons to investigate the effects of elevated CO₂ (e-CO₂) (550 µmol mol⁻¹) and elevated CO₂ (550 µmol mol⁻¹) + elevated temperature (+2 °C over ambient) (e-CO₂ + T) on biomass production, carbon (C) and nitrogen (N) concentration in plant parts, its allocation and grain quality in a tropical rice (cultivar-Naveen) under open top chambers (OTCs). The aboveground plant biomass, root biomass, leaf area index and net C assimilation rates were increased significantly under e-CO₂ to that of ambient CO₂ in control chamber CC by 32, 26, 21 and 37 %, respectively over the three dry cropping seasons. The grain yield was significantly higher under e-CO₂ compared to CC (21.6 %), although the higher temperature in e-CO₂ + T significantly reduced the yield advantage by 8.5 % overe-CO₂. The amylose content was significantly increased by 10 % under e-CO₂ + T over CC. In dry season, CO₂ fertilization enhanced the rice yield by 21.6 % but the yield advantage of CO₂ fertilization were reduced by 8.5 % due to elevated temperature. We did not found any deterioration ingrain quality in elevated temperature (2 °C) in low land rice ecologies.
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