Start Date

1-12-2009 12:00 AM

Description

Nitrate (NO3-N) pollution in rivers and streams from surface runoff and leaching to groundwater is a major problem across the United States (Nolan et al., 1998; Burkart and James, 1999; USGS, 2001) and Iowa as well. Previous work (Keeney, 1989; Burkart and James, 1999; Schilling and Libra, 2000) indicates that agricultural land use has been identified as the main contributor to the NO3-N load in our rivers and streams. The high mobility of NO3-N makes it readily available for leaching through the soil profile, especially during the periods when no active plant growth is taking place between harvest and planting (in absence of a cover crop) to capture residual soil nitrate. By implementing management practices that deter NO3-N leaching we may also reduce the NO3-N load in rivers and streams.

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Dec 1st, 12:00 AM

Tillage and cover crop effects on productivity, soil properties, and nitrate leaching

Nitrate (NO3-N) pollution in rivers and streams from surface runoff and leaching to groundwater is a major problem across the United States (Nolan et al., 1998; Burkart and James, 1999; USGS, 2001) and Iowa as well. Previous work (Keeney, 1989; Burkart and James, 1999; Schilling and Libra, 2000) indicates that agricultural land use has been identified as the main contributor to the NO3-N load in our rivers and streams. The high mobility of NO3-N makes it readily available for leaching through the soil profile, especially during the periods when no active plant growth is taking place between harvest and planting (in absence of a cover crop) to capture residual soil nitrate. By implementing management practices that deter NO3-N leaching we may also reduce the NO3-N load in rivers and streams.