Effects of nitrogen application on carbon metabolism of soil microbial communities in eucalyptus plantations with different levels of soil organic carbon Responses of yield and quality to nitrogen fertilization for oilseed rape cultivars with different nitrogen efficiencies Effect of nitrogen applied levels on the dynamics of biomass, nitrogen accumulation and nitrogen fertilization recovery rate of cotton after initial flowering Agronomic responses to nitrogen application and nitrogen utilization in rice fields Root morphology and nitrogen accumulation in soybean (Glycnie max L.) under different nitrogen application levels Characteristics of Nutrient Uptake and Utilization of Mid-Season Hybrid Rice under Different Nitrogen Application Rates in Different Locations of Southwest China The effects of elevated atmospheric CO2 concentration on wheat straw decomposition and nitrogen distribution in paddy soil Effect of Nitrogen Application Level on Nitrogen Use Efficiency in Wheat and Soil Nitrate-N Content under Bed Planting Condition