Water Table Fluctuation and Depth of Rooting of Citrus Trees in the Indian River Area

million fluorine was found in certain leaf samples, no clear correlation between fluorine content and degree of chlorosis was apparent. Normal leaves taken outside the affected area showed from 12 to 30 p.p.m. fluorine. It has been reported by Kaudy, et al. (3) that citrus leaves in California, obtained near an industrial plant, showed up to 211 p.p.m. fluorine. How ever, no chlorosis was reported in that area. Since analysis of citrus leaves were erratic, samples of an air plant, Spanish Moss (Tillandsia Usneoides), were collected at varying distances from one of the triple-superphos phate plants and analyzed for fluorine. The results, shown in Table 1, indicate that fluorine was being released in the manufacturing op-