Effects of nitrogen application rate on soil inorganic nitrogen distribution,microbial biomass nitrogen content and yield of wheat DIFFERENCE OF NITROGEN UPTAKE AND UTILIZATION IN WHEAT CULTIVARS  WITH DIFFERENT GRAIN YIELD LEVEL Effects of nitrogen application rate on the nitrogen uptake and utilization of cotton grown in coastal saline fields of Yangtze River Valley Effect of row spacing on nitrogen uptake, nitrogen utilization and yield of summer maize Characterization of Nitrogen Uptake and Utilization in Rice under Different Planting Methods General Characteristics of Nitrogen Uptake and Utilization in Conventional Indica Rice Cultivars with Different Panicle Weight Types Effects of nitrogen application rates on nitrogen uptake and utilization of direct-seeded cotton after wheat harvest.