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Illinois Fertilizer Conference Proceedings
January 26-28, 1998

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Table 2. Influence of water source upon average NO3-N concentration
as sampled weekly beginning in 1993 to September 1997 within
Lake Bloomington watershed, McLean County, IL.
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Water Source NO3-N (ppm)
Tile water - row crop ag production fields 17.1
Surface water runoff – ag production fields 6.5
Tile water - organic agriculture 10.2
Ground water - Artesian well 1.1
Rain water 1.1
Tile water – pasture/wooded field 1.4
Creek water - urban effect (enters town – leaves town) -0.9
Small pond within watershed 1.9
Creek water – Money Creek 12.1

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