Obreza, Thomas A., Mongi Zekri, and Edward A. Hanlon. 2020. “Nutrition of Florida Citrus Trees, 3rd Edition: Chapter 4. Soil and Leaf Tissue Testing: SL458/SS671, 2/2020”. EDIS 2020 (2). Gainesville, FL. https://doi.org/10.32473/edis-ss671-2020.