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Drainage with Perforated Plastic Tubing¹

The feasibility of placing drains at shallow depths and close together to improve drainage conditions on a planosol was evaluated. Field lysimeters were obtained by surrounding soil blocks with vertical sheets of heavy plastic penetrating well into the impermeable subsoil. Perforated plastic tubing placed 22.5 feet (approx. 6.9 m) apart at a depth of 20 inches (approx. 51 cm) provided adequate drainage. Dupuit alfalfa yielded better than 10 T/A dry matter. Manganese levels were below concentrations considered toxic. When a spacing of 45.0 feet (approx. 13.7 m) was used, the alfalfa yields were greatly reduced, and the manganese concentrations were well above levels considered toxic.

Key Words: alfalfa • manganese • water table

² Formerly Assistant in Soils (now Soil Physicist, Forest Hydrology Laboratory, Wenatchee, Wash.); Associate Professor, Dept. of Soils; former Assistant Professor, Dept. of Agr. Engr. (now Professor, Dept. of Agr. Engr., Imperial Ethiopian College of Agricultural and Mechanical Arts, Addis Ababa, Ethiopia); and Associate Professor, Dept. of Agr. Engr., respectively.

Received for publication May 9, 1968.