Limited Advantages of Green Manure Planting on Soil Nutrients and Productivity in Intensive Agriculture: A Case Study of Wheat–Maize–Sunflower Rotation in Hetao Irrigation District. - Zhao, Na; Zhang, Jun; Li, Xiaohong; Ma, Jun; Cao, Jufeng; Liu, Hanjiang; Wang, Xiquan; Bai, Lanfang; Wang, Zhigang (Agronomy, 2024)