Effect of elevated CO 2 and temperature on phosphorus efficiency of wheat grown in an Inceptisol of subtropical India
作者： Manoj-Kumar , A. Swarup , A.K. Patra , J.U. Chandrakala , K.M. Manjaiah
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摘要: In a phytotron experiment, wheat was grown under two levels of atmospheric CO 2 [ambient (385 ppm) vs. elevated (650 ppm)], temperature (ambient ambient +3°C) superimposed with three phosphorus (P) fertilization: 0, 100, and 200% recommended dose. Various measures P acquisition utilization effi ciency were estimated at crop maturity. general, dry matter yields all plant parts increased (EC) decreased (ET); however, concurrently (ECT), root (+36%) leaf (+14.7%) weight while stem (–12.3%) grain yield (–17.3%) decreased, leading to non-significant effect on total biomass yield. Similarly, uptake EC ET, an overall increase 17.4% ECT, signifying higher requirements by plants thereunder. Although recovery efficiency applied fertilizer 27%, any possible benefit this negated the reduced physiological (PPE) (PUtE) ECT. Overall, there ~17% decline in use (PUE) (i.e. yield/applied P)
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