Impact of Nitrogen and Water Management on Ground Water Qualityby James S. Schepers, Univ of Nebraska, Lincoln, United States,
Milton G. Moravek, Univ of Nebraska, Lincoln, United States,
Ronald Bishop, Univ of Nebraska, Lincoln, United States,
Abstract: Nitrate-nitrogen (NO3-N) concentrations in shallow ground water of the Platte River Valley in Central Nebraska have been increasing since the 1950s when irrigation and nitrogen (N) fertilizer made corn production consistently profitable. The ground water protection program initiated by the Central Platte Natural Resource District (CPNRD) in 1987 was the first comprehensive N management program in Nebraska. Production data for the 1988 and 1989 growing seasons showed that yield expectations were overly optimistic and average fertilizer N application rates exceeded recommendations. Excessive rates of N fertilizer application resulted in larger than normal amounts of carryover N at the end of the growing season and higher than average NO3-N concentrations in ground water used for irrigation.
Subject Headings: Groundwater quality | Groundwater management | Water resources | Groundwater pollution | Nitrogen | Quality control | Groundwater supply | Nebraska | North America | United States
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