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Nitrogen and Phosphorus Leaching from Growing Season versus Year-Round Application of Wastewater on Seasonally Frozen Lands

^a Agriculture and Agri-Food Canada, Lethbridge Research Center, P.O. Box 3000, 5403 - 1st Avenue South, Lethbridge, AB T1J 4B1, Canada
^b Department of Soil, Water, and Climate, University of Minnesota, 1991 Upper Buford Circle, Room 439, St. Paul, MN 55108-6028

View larger version (26K): [in a new window]   Fig. 1. Sketch map showing the location of the growing season (GS) and nongrowing season (NGS) sprayfields, lysimeters, and monitoring wells up-gradient and down-gradient of the sprayfields.

View larger version (32K): [in a new window]   Fig. 2. Schematic diagram of the drainage lysimeter used to monitor nutrient leaching.

View larger version (27K): [in a new window]   Fig. 3. Temporal variation in (a) median concentrations and (b) leaching losses of total phosphorus (TP) at control sites and at sprayfields receiving wastewater application during the growing season and nongrowing season. The nongrowing season sprayfields also received partially treated wastewater during the growing season.

View larger version (22K): [in a new window]   Fig. 4. Temporal variation in total P concentration in ground water compliance monitoring wells up-gradient and down-gradient of (a) growing season (GS) sprayfields and (b) nongrowing season (NGS) sprayfields.

View larger version (28K): [in a new window]   Fig. 5. Temporal variation in (a) median concentrations and (b) leaching losses of NO3–N at control sites and at sprayfield sites receiving wastewater application during the growing season and nongrowing season. The nongrowing season sprayfields also received partially treated wastewater during the growing season.

View larger version (22K): [in a new window]   Fig. 6. Temporal variation in NO3–N concentration in ground water compliance monitoring wells up-gradient and down-gradient of (a) growing season (GS) sprayfields and (b) nongrowing season (NGS) sprayfields.

View larger version (26K): [in a new window]   Fig. 7. Temporal variation in median concentrations (a) and leaching losses (b) of total Kjeldahl nitrogen (TKN) at control sites and at sprayfield sites receiving wastewater application during the growing season and nongrowing season. The nongrowing season sprayfields also received partially treated wastewater during the growing season.