Research in Florida across three citrus varieties confirms that tree loss due to citrus blight is significantly lower where calcium nitrate is a major component of the fertilizer program. The most responsive variety was Hamlin where tree death was halved.
Increased field evidence suggests that the use of calcium nitrate fertilizers helps reduce the impact of citrus blight. Trees are more productive and live longer than those in groves treated with ammonium nitrate. They generally have greater foliage, more vigor, and produce larger diameter, heavier fruit, with more juice.