1. USDA-ARS-PWA; 24106 N. Bunn Rd. Prosser WA 99350 USA
2. Institute of Soil Science, Academia Sinica; Nanjing 210008 People's Republic of China
3. Univ. of Florida, Institute of Food and Agricultural Sciences; Citrus Research and Education Center; 700 Experiment Station Rd. Lake Alfred FL 33850 USA