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Reduction of Nitrate Leaching with Haying or Grazing and Omission of Nitrogen Fertilizer

USDA-ARS, P.O. Box 488, Coshocton, OH 43812

View larger version (21K): [in a new window]   Fig. 1. Map of the 17.2-ha study area, showing four pastures (solid lines), gaged watersheds (dashed lines), rain gages, and spring-flow measurement sites. Watersheds (WS) 102 and 135 were grazed rotationally; WS 104 and 129 had forage removed as hay.

View larger version (30K): [in a new window]   Fig. 2. Annual subsurface flow throughout the 11-yr pre-study period (1979–1990) and the 7-yr study period (1990–1997).

View larger version (27K): [in a new window]   Fig. 3. Average flow-weighted seasonal (growing and dormant) concentration of NO3–N for subsurface flow throughout the 11-yr pre-study period (1979–1990) during which 168 kg N ha–1 was applied annually to rotationally grazed pastures, and the 7-yr study period (1990–1997) during which no N fertilizer was applied and two watersheds were grazed and two were hayed. Each year notation is a grazing year (May–April).

View larger version (27K): [in a new window]   Fig. 4. Annual NO3–N transport in subsurface flow throughout the 11-yr pre-study period (1979–1990) during which 168 kg N ha–1 was applied annually to rotationally grazed pastures, and the 7-yr study period (1990–1997) during which no N fertilizer was applied and two watersheds were grazed and two were hayed. Each year notation is a grazing year (May–April).