Clear away large debris and plants from the area being treated. Established plants can stay but may be affected by the excessive amount of water used in the leaching process. Temporarily transplant water-sensitive plants to containers, if possible.
Saturate the soil with water. The area must be soaked with water to several inches below the surface in order to leach out the soluble nitrogen.
Maintain this level of saturation for at least three days.
Take a soil sample to your local cooperative extension office for testing. Repeat the leaching process if the nitrogen level is still too high.
Purchase a low-nitrogen mulch such as wood chip mulch or sawdust.
Spread mulch over the affected area to draw out the excess nitrogen. Cover the soil completely, but a deep covering is not necessary.
Take a soil sample to the local cooperative extension office for testing at the end of the season. Add more mulch if the nitrogen level is still too high.