Effect of nitrogen fertilizer on dry matter accumulation and yield in wheat/maize/soybean intercropping systems Effects of Different Maturity Maize Cultivars Relay-cropping in Spring-sown and Summer-sowing on the Nutritive Values of Whole Plant for Feeding Effects of Nitrogen Management on Yield and Dry Matter Accumulation and Translocation of Maize in Maize-Soybean Relay-Cropping System Phosphrous aftereffects on soybean yield and nutrition status in wheat/maize/soybean intercropping system Effects of phosphorus and potassium fertilization on potassium accumulation and utilization efficiency of relay-cropping soybean Effects of Shading in Maize/Soybean Relay-Cropping System on the Photosynthetic Characteristics and Yield of Soybean