Fertilizer P Use Efficiency in Wheat under Elevated Atmospheric CO_2 and Temperature in Subtropical India: A ~(32)P Tracer Study

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NSTL

外文摘要：A phytotron experiment was undertaken in which wheat was grown as a test crop under two levels of atmospheric CO_2: ambient (385 mu mol mol~(-1)) and elevated (650 umol mol~(-1)); two levels of temperature: ambient (ambient air temperature of rabi season in Subtropical India) and elevated (ambient+3 deg C); and three levels of P: zero (control), 100% and 200% of recommended P dose to wheat. There were significant increases in total P and fertilizer P uptake by plant under singly elevated CO_2 as wellas concurrently elevated CO_2 and temperature, with no significant change in %Pdff. As a consequence, fertilizer P use efficiency (PUE) also showed significant improvements both under the elevated CO_2 alone as well as under combined elevation of CO_2 and temperature. While this increase in fertilizer PUE was a welcome change under the projected levels of CO_2 and temperature, low efficiency at higher doses of P application still remained a matter of concern.

外文关键词：

Elevated CO_2TemperatureWheatFertilizer P use efficiency

作者：

K.M. MANJAIAH、RAJENDRA SINGH、MANOJ-KUMAR、ANAND SWARUP、A.K. PATRA

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作者单位：

Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi-110012, India

National Phytotron Facility, Indian Agricultural Research Institute, New Delhi-110012, India

Division of Soil Science, ICAR Research Complex for NEH Region, Umiam, Meghalaya- 793103, India

出版年：

2010

Journal of nuclear agriculture and biology

ISSN：0379-5489

年,卷(期)：2010.39(1/4)