See more from this Session: General Soils and Environmental Quality: I
This study examined nitrogen and phosphorus leaching in tall fescue (Festuca arundinacea) plots under three different grazing techniques: no grazing (NG); deferred grazing (DG); and standard management intensive grazing (MIG). The NG plots were mechanically harvested. The DG plots utilized standard MIG until the last grazing event when it was allowed to stockpile until November, when it was the only treatment grazed. Plots were grazed for 24 hours, approximately every 6 weeks.
Zero-tension lysimeters, 38.1 cm in diameter and 1.12 meters in depth, were built using a hollow-core drill to obtain undisturbed soil cores. PEX tubing running underground from the collection reservoir at the base of the lysimeter to a vacuum pump outside of the plot area was utilized for leachate collection. Leachate was collected bi-weekly and analyzed for nitrate-nitrite and inorganic dissolved phosphorus. Soil cores were take at the beginning and end of each grazing season and analyzed for nitrogen and phosphorus. Results from a three-year study will be presented.