Drainage Lysimeters for High Water Table Citrus Studiesby Brian J. Boman, Univ of Florida, Ft. Pierce, United States,
Jim P. Syvertsen, Univ of Florida, Ft. Pierce, United States,
Abstract: Forty drainage lysimeters were installed in 1988 to conduct water quality and consumptive use studies for citrus. The lysimeters were designed to simulate the high water table conditions that exist for the 150,000 ha of citrus grown in the Florida Flatwoods. The lysimeters were constructed from 3.5 m diameter by 1.0 m deep polyethylene tanks. Five-year-old trees were transplanted into the lysimeters in 1988. Trees were watered with microirrigation systems (drip and microsprinkler) and all irrigation and drainage water was metered. Leachate was accumulated in drain tubing in the tank bottoms and water table levels were maintained by float controlled pumps. Annual ET averaged 1140 mm tree-1 for November 1989 through November 1990. About 8% of the applied N was lost by leaching to the water table. Construction and installation details are presented along with operation and maintenance considerations and ET measurements.
Subject Headings: Drainage | Measuring instruments | Water table | Water level | Trees | Leaching | Water tanks | Water quality | North America | Florida | United States
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