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Effects of Scheduling Municipal Waste-Water Effluent Irrigation of Reed Canarygrass on Nitrogen Renovation and Grass Production¹

ABSTRACT

A 2-year field experiment was conducted to test the performance of reed canarygrass (Phalaris arundinacea L.) and the removal of nitrogen from municipal waste-water effluent under varying irrigation schedules. The effluent was obtained from an activated sludge treatment facility that served a domestic suburban population. The 1st-year total application to the 12- by 12-m plots was about 170 cm of effluent containing 320 kg/ha N, primarily in the ammonia form. The 2nd-year application consisted of about 290 cm of effluent containing $30 kg/ha N. Treatments during both years were comprised of 1, 2, or 5 irrigations per week. Results indicated that there was no effect of varying the irrigation schedule on the reed canarygrass yields, which averaged 10.2 and 15.0 metric tons/ha during the 1st and 2nd year, respectively. There also was no effect on soil water N concentrations, which averaged 1.0 and 2.4 mg/liter during the 1st and 2nd year, respectively.

Key Words: soil water • matric potential • crop N uptake • Phalaris arundinacea L.

¹ Contribution of the Soil and Water Management Research Unit, North Central Region, USDA-SEA-AR, in cooperation with the Minnesota Agric. Exp. Stn.; Scientific Journal Series Paper no. 11235. Research supported in part by the U.S. Army Corps of Engineers and the Metropolitan Waste Control Commission, St. Paul, Minn.

² Soil Scientist, USDA-SEA-AR, and Assistant Professor, Dep. of Soil Sci., Univ. of Minnesota, St. Paul, MN 55108; Research Chemist USDA-SEA-AR, and Professor, Dep. of Soil Sci., Univ. of Minnesota; and Associate Professor, Dep. of Agric. Eng., Univ. of Nebraska, Lincoln, respectively.

Received for publication November 21, 1980.