1. National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Tai’an, Shandong, China
2. College of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan, China
3. Soil Fertilizer Station, Yantai Academy of Agricultural Sciences, Shandong, China
4. Soil Fertilizer Station, Wendeng Agricultural Bureau, Shandong, China