Tillage and N-Source Effects on NO3-N Leaching Losses to Subsurface Drainage Water
Publication: World Environmental and Water Resource Congress 2006: Examining the Confluence of Environmental and Water Concerns
Abstract
An appropriate combination of tillage and source of nitrogen fertilizer can reduce NO3-N leaching losses to subsurface drain water. A field study was conducted from 1999 through 2003 on tile drained fields to determine the effects of liquid swine manure (LSM) application under, no-till (NT) and urea ammonium nitrate (UAN) application under chisel plow (CP) on corn [Zea mays L.] and soybean [Glycine max (L) Merr.] yield and NO3-N leaching losses with subsurface drain water. Four treatments of LSM (165 kg-N ha–1) with NT and UAN (170 kg-N ha–1) with CP applied to corn were replicated three times in a randomized complete block design. Seasonal effects were found to be significant (P<0.01) and above normal rainfall during the growing season for the months of July and August in 2002 resulted in highest corn and soybean yields of 12 Mg ha–1 and 3.6 Mg ha–1, respectively, with minimum NO3-N leaching loss of 3 kg-N ha–1. The LSM with NT plots in comparison to UAN application to CP plots resulted in significantly (P<0.01) lower flow weighted average NO3-N concentrations (12 vs. 16 mg L–1) due to dilution effects of greater subsurface drainage volume from NT plots by 73% (142 vs. 82 mm). Treatment effects on corn-soybean yields and NO3-N leaching losses were not significant but LSM with NT gave higher NO3-N leaching losses in comparison with UAN under CP treatment (15 vs. 11 kg-N ha–1).
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Copyright
© 2006 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Agriculture
- Chemical processes
- Chemistry
- Climates
- Crops
- Drainage
- Engineering fundamentals
- Environmental engineering
- Field tests
- Groundwater
- Irrigation engineering
- Leaching
- Nutrient pollution
- Pollution
- Seasonal variations
- Subsurface drainage
- Surface drainage
- Tests (by type)
- Water (by type)
- Water and water resources
- Water management
- Water pollution
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