Major points:
  • Quantity and timing of tile flow is different from surface runoff.
  • Soil and phosphorus are generally lost from the surface, not tile lines.
  • Nitrogen is transported in tile lines.
Management tips:
  • Maintain tile systems to prevent soil and particulate phosphorus loss.
  • Check soil test phosphorus levels to reduce dissolved phosphorus loss.
  • Consider timing and rate of nutrient application to reduce nitrogen loss.