1. Department of Agricultural & Biological Engineering, University of Florida, 1741 Museum Road, Gainesville, Florida 32611-0570, United States
2. Department of Soil and Water Sciences, Tropical Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, 18905 SW 280 Street, Homestead, Florida 33031, United States
3. Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, 700 Changcheng Road, Qingdao 266109, China
4. Institute of Plant Nutrition and Resource, Beijing Academy of Agriculture and Forestry Sciences (BAAFS), 9 Shuguanghuayuan Middle Road, Beijing 100097, China