The relationship between leaf N and RUE was curvilinear. The conversion efficiency of intercepted radiation to dry matter, radiation-use efficiency (RUE), was about 35% greater at elevated than at ambient. Plant N requirement for radiation interception was similar for rice grown under ambient or elevated treatments. Light interception was not directly affected by, but elevated indirectly increased light interception through increasing total absorbed N. Rice plants were grown inside open top chambers in a lowland rice field at the International Rice Research Institute in the Philippines at ambient (about 350 μmol mol⁻¹) or elevated (about 600 μmol mol⁻¹ during the 1993 wet season and 700 μmol mol⁻¹ during the 1994 dry season) in combination with three levels of applied N (0, 50 or 100 kg N ha⁻¹ in the wet season 0, 90 or 200 kg N ha-1 in the dry season). IR72) grown under tropical field conditions. The objectives of this study were to determine the interaction of N fertilization rates and atmospheric on radiation interception and radiation-use efficiency of rice (Oryza sativa L. In order to predict the potential impacts of global change, it is important to understand the impact of increasing global atmospheric on the growth and yield of crop plants.
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