See more from this Session: Turf Soil and Water Management
Monday, November 1, 2010: 10:00 AM
Long Beach Convention Center, Room 102B, First Floor
Centipedegrass (Eremochloa ophiuroides [Munro] Hack) and St. Augustinegrass (Stenotaphrum secundatum [Walt.] Kuntze.) were established as sod at the University of Florida, West Florida REC in 2006. Over three (2006-09) winter seasons (Sep – Mar), urea nitrogen (N) was applied every 45d to plots at rates of 0, 6.1, 12.3, 24.5, and 49.0 kg N ha-1. Each plot contained a lysimeter with a surface area of 0.22 m2. Leachate collection was conducted weekly. Data collection included total NO-3-N leached and turf quality, color, and density. The initial sampling (2006) yielded greater quantities of NO-3-N leaching than subsequent leaching cycles which was likely due to the N that was applied during the production of the sod prior to installation on the research site. At no time during 2007-08 did NO-3-N leach to any significant level regardless of turf species or rate of applied N. The average leaching during the five cycles ranged from 0.2 –5.0% of applied N. At times, N leaching from untreated plots exceeded that from N-treated plots. In 2008-09, negligible quantities of NO-3-N leached from either turf species during the first two fertilizer cycles. During the third, fourth, and fifth cycles, however, the 49.0 kg ha-1 N rate had increased levels of NO-3-N in the leachate. This equates to 5.8% of the applied N when looking at the final fertilizer cycle. No differences in NO-3-N leaching occurred between centipedegrass and St. Augustinegrass in 2008-09.