1. Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
2. Department of Crop Sciences, University of Illinois Urbana-Champaign, Urbana, Illinois, USA
3. College of Water Resources and Civil Engineering, China Agricultural University, Beijing, P. R. China
4. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, P. R. China
5. Department of Natural Resource Sciences, McGill University, Quebec, Canada
6. Key Laboratory of Organic Compound Pollution Control Engineering (MOE), Shanghai University, Shanghai, P. R. China