Han, Xuemei, Cheng Hu, Yunfeng Chen, Yan Qiao, Donghai Liu, Jun Fan, Shuanglai Li, and Zhi Zhang. “Soil Nitrogen Sequestration in a Long-Term Fertilizer Experiment in Central China”. Spanish Journal of Agricultural Research 18, no. 1 (April 22, 2020): e1102. Accessed May 3, 2025. https://sjar.revistas.csic.es/index.php/sjar/article/view/15691.