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Permanent Link: http://ufdc.ufl.edu/IR00002665/00001
 Material Information
Title: Citrus Tree Stresses: Effects on Growth and Yield
Physical Description: Fact Sheet
Creator: Syvertsen, J.
Publisher: University of Florida Cooperative Extension Service, Institute of Food and Agriculture Sciences, EDIS
Place of Publication: Gainesville, Fla.
Publication Date: 2008
 Notes
Acquisition: Collected for University of Florida's Institutional Repository by the UFIR Self-Submittal tool. Submitted by Melanie Mercer.
Publication Status: Published
General Note: "Original publication date May, 2008."
General Note: "HS1138"
 Record Information
Source Institution: University of Florida Institutional Repository
Holding Location: University of Florida
Rights Management: All rights reserved by the submitter.
System ID: IR00002665:00001


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HS39300 ( PDF )


Full Text

PAGE 1

HS1138 Citrus Tree Stresses: Effects on Growth and Yield 1 J. Syvertsen and E.A. Hanlon2 The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. U.S. Department of Agriculture, Cooperative Extension Service, University of Florida, IFAS, Florida A. & M. University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Larry Arrington, Dean Introduction Understanding Citrus Root-to-Shoot Ratios minimize changes

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Citrus Tree Stresses: Effects on Growth and Yield 2 maintain that ratio as low as possible Water and nutrient management effects on root-to-shoot ratio drought salinity Low nitrogen high nitrogen Understanding Citrus Tree Composition and Potential Water Requirements rainfall and irrigation sources Figure 1. Average monthly rainfall and evapotranspiration (ET) at Lake Alfred, FL (Courtesy of T.A. Obreza from historical records from FAWN)

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Citrus Tree Stresses: Effects on Growth and Yield 3 Root compensation Using Irrigation Effectively Root loss Flooding Phytophthora Figure 2. Citrus trees can withstand flooding for only short durations and can start to lose roots when exposed to flooding more than 72 hours. (Photo courtesy of Dr. R. E. Rouse, UF/IFAS SWFREC) Defoliation due to freezes

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Citrus Tree Stresses: Effects on Growth and Yield 4 Figure 3. A freeze caused 90% defoliation in this non-irrigated grove. Established canopy pruning (hedging and toping) Water, carbon, and nutrient budgets Figure 4. Schematic representation of citrus tree root-to-shoot adjustments based upon inputs of water and nutrients from soil and carbon (C) from CO2 in the air. Rootstock effects Sheepnosing Sheepnosing

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Citrus Tree Stresses: Effects on Growth and Yield 5 Figure 5. An example of sheepnosing in grapefruit. Conclusions Additional Information

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Citrus Tree Stresses: Effects on Growth and Yield 6 Citrus In Table 1. Measurement Effect of proper irrigation Juice content Increased Soluble solids Decreased Acid Decreased Soluble solids to acid ratio Increased Color No Effect Solids per box Decreased Solids per acre Increased Fruit size Increased Fruit weight Increased Green fruit Increased Peel thickness Decreased