Plant Soil Environ., 2012, 58(5):230-235 | DOI: 10.17221/749/2011-PSE

Effect of elevated CO2 and temperature on phosphorus efficiency of wheat grown in an Inceptisol of subtropical India

Manoj-Kumar1, A. Swarup1, A.K. Patra1, J.U. Chandrakala2, K.M. Manjaiah1
1 Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi, India
2 Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, India

In a phytotron experiment, wheat was grown under two levels of atmospheric CO2 [ambient (385 ppm) vs. elevated (650 ppm)], two levels of temperature (ambient vs. ambient +3°C) superimposed with three levels of phosphorus (P) fertilization: 0, 100, and 200% of recommended dose. Various measures of P acquisition and utilization efficiency were estimated at crop maturity. In general, dry matter yields of all plant parts increased under elevated CO2 (EC) and decreased under elevated temperature (ET); however, under concurrently elevated CO2 and temperature (ECT), root (+36%) and leaf (+14.7%) dry weight increased while stem (-12.3%) and grain yield (-17.3%) decreased, leading to a non-significant effect on total biomass yield. Similarly, total P uptake increased under EC and decreased under ET, with an overall increase of 17.4% under ECT, signifying higher P requirements by plants grown thereunder. Although recovery efficiency of applied P fertilizer increased by 27%, any possible benefit of this increase was negated by the reduced physiological P efficiency (PPE) and P utilization efficiency (PUtE) under ECT. Overall, there was ~17% decline in P use efficiency (PUE) (i.e. grain yield/applied P) of wheat under ECT.

Keywords: climate change; wheat yield; 32P tracer; Indo-Gangetic plains; P nutrition

Published: May 31, 2012  Show citation

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Manoj-Kumar, Swarup A, Patra AK, Chandrakala JU, Manjaiah KM. Effect of elevated CO2 and temperature on phosphorus efficiency of wheat grown in an Inceptisol of subtropical India. Plant, Soil and Environment. 2012;58(5):230-235. doi: 10.17221/749/2011-PSE.
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