RECLAIMED WASTEWATER IRRIGATION OF RESET 'MARSH' GRAPEFRUIT TREES

MAURER, MICHAEL A.

Abstract


Two field studies were conducted near Vero Beach, Fla. in an established grove of 25-year old 'Marsh' grapefruit trees to determine the effects of reclaimed wastewater on the growth and development of reset 'Marsh' grapefruit trees. 'Marsh' grapefruit trees ( Citrus paradisi Macf.) on 'Swingle' citrumelo rootstock (C. paradisi Macf. × Poncirus trifoliata [L.] Raf.) were planted on 21 Nov. 1990 (Expt. 1) and on sour orange rootstock ( C. aurantium L.) on 2 Mar. 1993 (Expt. 2). Treatments consisted of a control (canal water) applied based on soil water depletion and reclaimed wastewater applied at 0.75, 1.00 and 1.25 inches/wk. All trees received 0.5, 0.75 and 1.0 lb N/tree/yr for 1-, 2- and 3-year old trees, respectively. Tree growth and vigor were similar for all trees in Expts. 1 and 2. Leaf tissue N concentration was similar for all trees in 1991 (Expt. 1) and 1993 (Expt. 2), but trees receiving reclaimed wastewater tended to have lower leaf N concentrations in 1992 and 93 (Expt. 1). Leaf Na was significantly lower and Ca higher for control trees in 1991 (Expt. 1) and 1993 (Expt. 2), but all trees had similar leaf Na and Ca levels in 1992 and 1993 (Expt. 1). Trees receiving reclaimed wastewater tended to have higher leaf K and B levels than the control trees; however, B levels were not in the toxic range. Leaf P, Mg, Cu, Mn, and Zn levels were similar for all trees. All reclaimed wastewater treatments caused significantly greater weed growth than the control treatment. Reclaimed wastewater can be effectively used to irrigate resets with no deleterious effects provided that weed growth is controlled.

Keywords


citrus paradisi; effluent; nutrition

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283