Abstract
A field study was conducted near Vero Beach, Fla. on poorly drained (flatwoods) soil to determine the effects of reclaimed water on the growth and development of mature `Redblush' grapefruit trees (Citrus paradisi Macf.) on sour orange (Citrus aurantium L.) rootstock. Treatments consisted of a control (canal water), and reclaimed water applied at 2.31, 3.07 and 3.86 cm/wk. For the first two years after treatments were implemented there were no significant differences among treatments in yields, trunk diameter, fruit growth rates or fruit quality (fruit and juice weight, total soluble solids, acids or solids:acid ratio), and leaf nutrient levels. Moreover, although reclaimed water increased leaf B, Na and Cl levels over control values, no toxicity symptoms were observed. Soil moisture content was always well above field capacity for the reclaimed water treatments; however, soil redox potentials rarely were in the anaerobic range. The reclaimed water treatment receiving 3.86 cm/wk also provided about 80 kg/ha of N which is ⅔ of the yearly N requirement. All reclaimed water treatments caused significantly greater weed growth than control treatments.
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