Regulation of Nitrogen Level on Photosynthetic Energy Partitioning in Wheat Leaves under Elevated Atmospheric CO2 Concentration NODULE CHARACTERISTICS OF THREE-YEAR-OLD CARAGANA MICROPHYLLA AND THEIR RESPONSES TO ENVIRONMENTAL CHANGES IN AN INNER MONGOLIA GRASSLAND Effects of elevated CO2 concentration on the quality of agricultural products: A review.  Effects of nitrogen fertilization on wheat leaf photosynthesis under elevated atmospheric CO2 concentration.