Hochmuth, Robert C., Eric H. Simonne, Lei Lani Davis, and Wanda L. Laughlin. 2008. “Plant Part Selection and Preliminary Sufficiency Ranges for Sap Testing Interpretation of Greenhouse Herbs: HS1123/HS372, 11/2007”. EDIS 2008 (1). Gainesville, FL. https://doi.org/10.32473/edis-hs372-2007.