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Fluid Journal : Fluid Journal 2002-2004
presence of ammonium nitrogen from ammonium nitrate (Figure 1). So, in terms of citrus tree root health, calcium nitrate fertilizer clearly has a positive effect and is superior to ammonium ni- trate, ammonium sulfate, and urea. TREELONGEVITY With the high purchase cost of seed- lings and other inputs to bring it into production, sudden tree loss can be economically devastating. Here again, nitrate nitrogen improves tree longevity while ammonium decreases it. Fertilizer research, after two years of study by Florida scientists, suggests the following. Of 340 citrus trees, 17 trees (5.0%) fertilized with calcium ni- trate were considered economically un- productive. When sodium nitrate was used as the treatment, 6.8% or 23 trees were unproductive. With ammonium nitrate, 15.3% or 52 trees were consid- ered unproductive. The positive effects of the calcium nitrate treatments in this comparison are plainly evident. In terms of citrus longevity, calcium nitrate fertilizer has a definite positive effect and is superior to ammonium nitrate, ammonium sulfate, and urea. Research and commercial use have shown that the agronomics and economics of fertil- izing citrus with calcium nitrate are fully justified. Dr. Bill Easterwood is National Man- ager of Agronomy at Hydro Agri North America, Inc. , 100 N. Tampa St., Ste. 3200, Tampa, FL 33602.
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