Using the Illinois Soil N Test for Predicting Nitrogen Fertility Requirements in Turfgrass. (4104)
Authors:
D. Gardner* - The Ohio State University B.P. Horgan - University of Minnesota J.R. Street - The Ohio State University D.D. Holdren - The Ohio State University
Abstract:
Nitrogen (N) fertilization of turfgrass continues to be scrutinized due to
environmental concerns. Practices that reduce fertilizer inputs without sacrificing turfgrass quality are needed. A reliable test of N status in turfgrass is not currently available. The Illinois soil N test has been developed to predict crop response to applied N by measuring the amount of amino N in the soil. Amino N does not fluctuate as rapidly as other forms of N in soil. Our objective is to determine if the Illinois soil N test can be used to predict turfgrass response to N fertilizer and thus reduce unnecessary N inputs on unresponsive sites. A study was established in 2000 at The Ohio State University to determine the effect of Kentucky bluegrass (Poa pratensis L.) cultivar blend and fertilizer rates (49, 98, 196, or 294 kg N/ha/yr) on soil amino N level. Studies were established in 2004 to examine both spatial
variability and seasonal fluctuation of amino N in a Kentucky bluegrass soil profile.
Our initial data indicate that the test provides very reliable and quantitatively accurate results with repeated sampling.
Speaker Information: David Gardner, The Ohio State University, 344 Howlett Hall 2001 Fyffe Ct., Columbus, OH 43210; Phone: 614-763-0015; E-mail:
Session Information: Tuesday, November 2, 2004, 1:00 PM-3:00 PM Presentation Start: 1:00 PM (Poster Board Number: 1311)
