Effects of nitrogen and density interactions on grain yield and nitrogen use efficiency of double-rice systems Studies on the spatio-temporal variations of soil NO_3~--N and apparent budget of soil nitrogen Ⅰ. Winter wheat Effcet of N rates applied to summer maize on soil nitrate content during the following crop season and winter theat grain yield in Huang-Huai-Hai Plains Effects of nitrogen fertilizer rate and ration of base and topdressing on yield of wheat, content of soil nitrate and nitrogen balance Effects of different wheat cultivation methods on residual nitrate nitrogen in soil in dryland Effect of calcium-magnesia phosphate fertilizer on maize yield and its cadmium accumulation in upland red soil in Guangxi Effects of Nitrogen Fertilizer Rate and Post-anthesis Soil Moisture Content on Starch Synthesis and Quality of Grains in Strong Gluten Wheat Effects of irrigation frequency and fertilizer rate on alfalfa seed yields in the Yellow River irrigated region Effects of nitrogen on agronomic traits and dry matter yield and their relationship in sweet sorghum Effects of Nitrogen Fertilizer Rate on Uptake, Distribution and Utilization of Nitrogen in Winter Wheat under High Yielding Cultivated Condition Effects of nitrogen fertilizer rate and post-anthesis soil water content on yield and quality of high-quality strong gluten wheat Optimum combination of phosphorus, potassium and density for double-rice systems Effects of water and fertilizers on nitrate content in tomato fruits under alternate partial root-zone irrigation Effect of Nitrogen and Irrigation Interaction on Dry Matter Production and Grain Yield of Oil Flax under Different Irrigation Modes Yield responses of the main cereal crops to the application approaches and rates of zinc fertilizer in China Research on nitrogen fertilizer recommendation indicator system establishment using soil tested total N and organic matter in rapeseed Relationship between accumulated NO3-N in soil profiles and apparent nitrogen budget in winter wheat fields under nitrogen fertilization Study on simulation of "3414" fertilizer experiments ffects of nitrogen fertilizer rate and post-anthesis soil water content on characteristics of nitrogen metabolism and grain protein content in wheat Effects of nitrogen fertilizer rate and post-anthesis soil water content on photosynthetic characteristics in flag leaves and yield of wheat Effects of nitrogen fertilizer rate on senescence characteristics and yield of different peanut (Arachis Hypogaea L.)cultivars Grain Yield and Agronomic Traits of Winter Wheat Varieties in Response to Fertilization in Dryland Effects of Nitrogen Fertilizer Rate on Photosynthetic Character, Sucrose Synthesis in Flag Leaves and Grain Yield of Strong Gluten Wheat Jimai 20 Effects of Nitrogen Application Rates on Nitrogen Uptake and Use,Protein Accumulation,and Grain Yield in Malting Barkey Effects of irrigation and nitrogen fertilizer rates on oilseed flax stem lodging resistance and yield The Spatio-temporal Variations of Soil NO_3~--N and Apparent Budget of Soil Nitrogen Ⅱ. Summer Maize Effect of N, P and K fertilizer application and optimum rate for yield of millet Effects of different nitrogen fertilizer levels on dry matter and N accumulationof cotton under jujube and cotton intercropping Effects of Nitrogen Application Amount on Characteristics of Nitrogen Utilization and Yield Formation in High Yielding Early Hybrid Rice Characteristics of Accumulation and Distribution of Nitrogen and Dry Matter in Wheat at Yield Level of Ten Thousand Kilograms per hectare