1. Key Laboratory of Arable Land Quality Monitoring and Evaluation, Ministry of Agriculture and Rural Affairs, Yangzhou University, Yangzhou, China
2. Library of Guangling College, Yangzhou University, Yangzhou, China
3. Yangzhou Station of Farmland Quality Protection, Yangzhou, China
4. Silkworm Egg Management Institute, Jiangsu Agricultural Technology Extension and Service Center, Nanjing, China