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Nutrient disorders related to excessive levels of copper in soils are common in Florida citrus groves that have been under production for many years, mainly due to the continual use of copper-containing pesticides. The objectives of the study were to investigate the growth and nutritional response of six citrus rootstocks (nonbudded) grown in 4-L containers in sand to increasing concentrations of copper. The rootstocks included: Swingle citrumelo ( Citrusparadisi  Macf. ×  Poncirus trifoliata  [L.] Raf.), Volkamer lemon ( C. volkameriana  Ten. and Pasq.), Cleopatra mandarin ( Citrusreticulata  Blanco), Flying Dragon ( P. trifoliata ); and two new USDA series rootstocks, US-812 (Sunki mandarin ×  P. trifoliata  released in 2001), and US-897 (a hybrid of Cleopatra × Flying Dragon not yet released). Copper was supplied at 0.05, 0.25, 1.00, and 2.00 mg·L -1  CuEDTA incorporated into a modified Hoagland's nutrient solution. As a mean of all Cu treatments, whole plant Cu levels (μg·g -1 ) were: Flying Dragon, 17.33; US-897, 21.68; Cleopatra, 27.33; US-812, 28.84; Swingle, 29.74; and Volkamer, 34.05. As a mean of all Cu treatments, foliar Cu levels (μg·g -1 ) were greatest and least in US-812 (7.74) and Cleopatra (4.05), respectively; and root Cu levels (μg·g -1 ) were greatest and least in Volkamer (61.08) and Flying Dragon (30.08), respectively.

(330) Growth and Nutritional Response of Six Citrus Rootstocks to Increasing Levels of Copper