Summary: Stabilization of Soil Nitrate by Reseeding with Perennial Ryegrass .
following Sudden Turf Death
John T. Bushoven, Zhongchun Jiang, Heather J. Ford, Carl D. Sawyer, Richard J. Hull,* and Jose A. Amador
Turf death can result in the mineralization of organic nitrogen (N)
within the turf-soil ecosystem. If not reestablished within 12 mo, dead
turf can leach 10% of its total soil N as nitrate into ground water.
This study investigated how rapidly and completely soil N can be
restabilized following reseeding of killed turf. Twelve-year-old field
plots, comprising four cool-season turfgrass species growing on an
Enfield siltloani (coarse-silty over sandy-skeletal, mixed, active, mesic
Typic Dystrudepts) at Kingston, RI, were used. In early September
1997, one-half of the plots were killed by applying glyphosate and
three-fourths of the dead plots were reseeded with 'Palmer III' peren-
nial ryegrass (Loliu,n perenne L.) in late March 1998. Soil moisture,
temperature. pH, respiration, and extractable nitrate and ammonium
were monitored every 6 to 8 wk. Nitrate levels in subsoil water were
monitored at 2-wk intervals and nitrate leaching estimated for each
percolation event. Reseeding enhanced soil respiration, within 6 wk
of seeding, to levels comparable with those of soil in healthy plots.