Calcium (Ca) and Sulfur (S) for Citrus Trees

Figure 2. These fruit show calcium deficiency symptoms; they are undersized and misshapen with shriveled juice vesicles. Credit: Dr. R. C. J. KooCalcium and sulfur are sometimes called secondary nutrients. This term does not mean that these nutrients play a secondary role in citrus plant growth and development. Ca and S are as essential as N, P, K, Mg, and other nutrients for healthy plant growth. An inadequate supply of Ca and/or S can be a major constraint to crop production and quality. This 5-page fact sheet was written by Mongi Zekri and Tom Obreza, and published by the UF Department of Soil and Water Science, July 2013.