Effects of different management patterns on uptake, distribution and fate of nitrogen in summer maize Continuous-automatic method for measuring N2O emission from agricultural soil Nitrogen Uptake and Utilization of Summer Maize Hybrids with Different Plant Heights Study on the fate of nitrogen fertilizer in winter wheat/summer maize rotation system in Beijing suburban Canopy Structure and Photosynthesis Traits of Summer Maize under Different Planting Densities Effect of Plant Density on Grain Yield Dry Matter Accumulation and Partitioning in Summer Maize Cultivar Denghai 661 Effects of nitrapyrin-nitrogen (N) fertilizer application rates on N utilization and N2O emission in summer maize field.