Full TGIF Record # 136456
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Web URL(s):http://www.actahort.org/books/783/783_56.htm
    Last checked: 06/11/2008
    Access conditions: Item is within a limited access website
Publication Type:
i
Report
Author(s):Li, D.; Smith, R.; Kinzer, K.; Neate, S.
Title:Detecting brown patch and dollar spot development on Kentucky bluegrass by spectrometer sensing and tissue nitrate­N monitoring
Meeting Info.:Proceedings of the II International Conference on Turfgrass Science and Management for Sports Fields: Beijing, China, June 24-29, 2007.
Source:Acta Horticulturae. Vol. 783, February 2008, p. 547-558.
Publishing Information:Leuven, Belgium: International Society for Horticultural Science
# of Pages:12
Keywords:TIC Keywords: Rhizoctonia blight; Dollar spot; Disease identification; Poa pratensis; Disease forecasting; Application rates; Nitrogen level; Tissue testing; Nitrates; Disease severity; Nitrogen fertilization
Abstract/Contents:"Nitrogen affects all aspects of turf quality including color, density, stress tolerance, and susceptibility to diseases. Soil analysis usually does not include the available N in soil because it changes rapidly and the test is very time-consuming. Clipping yield is often used by turf managers as an indicator of N sufficiency. The primary objective of this study was to investigate if there was a correlation between Nitrate (NO3-)-N concentration in grass tissues and disease index for dollar spot and brown patch in Kentucky bluegrass (Poa pratensis L. 'Moonlight'). A second objective was to test the feasibility of using NO3-ion specific electrode and/or spectral radiance to monitor disease severity. N amounts (0, 50, 100 and 200 kg ha-1) were main plots and disease inoculations were subplots in trials conducted in 2004 and 2005. The normalized difference vegetation index (NDVI) from a spectral radiance measurement was very sensitive to disease stress level and N status. In both experiments, shoot and leaf NO3-N concentrations were significantly different among the N fertilization amounts in 70% of the sampling dates. In 2004, correlation coefficients between tissue NO3-N and N application amounts were 0.07 to 0.27 and 0.03 to 0.87 for leaf and shoot, respectively. In 2005, the correlation coefficients between tissue NO3-N and N application amounts were 0.30 to 0.51 and 0.29 to 0.78 for leaf and shoot, respectively. Dollar spot severity was negatively correlated to N nutrient levels in shoots and leaves with correlation coefficients as -0.60 and -0.61, respectively in 2004. Correlation coefficients between dollar spot severity and N nutrient levels in shoots and leaves were -0.87 and -0.81 for 3.8-cm mowing height, and -0.79 and -0.61 for 7.8-cm mowing height, respectively. Tissue NO3-N levels have potential to be used in dollar spot forecasting models in combination with environmental condition monitoring. Brown patch disease was less affected by tissue N levels but rather by microenvironment in the turf canopy."
Language:English
References:0
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Li, D., R. Smith, K. Kinzer, and S. Neate. 2008. Detecting brown patch and dollar spot development on Kentucky bluegrass by spectrometer sensing and tissue nitrate­N monitoring. Acta Horticulturae. 783:p. 547-558.
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http://www.actahort.org/books/783/783_56.htm
    Last checked: 06/11/2008
    Access conditions: Item is within a limited access website
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MSU catalog number: SB 13 .A25 no. 783
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