Full TGIF Record # 65405
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DOI:10.21273/HORTSCI.35.4.751
Web URL(s):https://journals.ashs.org/hortsci/view/journals/hortsci/35/4/article-p751.xml?rskey=YB0R53
    Last checked: 11/14/2019
    Requires: PDF Reader
Publication Type:
i
Refereed
Author(s):Rodriguez, Ian R.; Miller, Grady L.
Author Affiliation:Rodriguez: Graduate Assistant, Horticulture Department, Clemson University, Clemson, SC; Miller: Assistant Professor, Department of Environmental Horticulture, University of Florida, Gainesville, FL
Title:Using a chlorophyll meter to determine the chlorophyll concentration, nitrogen concentration, and visual quality of St. Augustinegrass
Section:Turf management
Other records with the "Turf management" Section
Source:HortScience. Vol. 35, No. 4, July 2000, p. 751-754.
# of Pages:4
Publishing Information:Alexandria, VA: American Society for Horticultural Science
Keywords:TIC Keywords: Chlorophyll; Chlorophyll index; Research equipment; Measurement; Evaluations; Nitrogen; Nitrogen fertility; Visual evaluation; Quality; Stenotaphrum secundatum; Iron; Nitrogen fertilization; Fertilization rates
Cultivar Names:Floratam; Floratine; Floralawn
Abstract/Contents:"Because high rates of nitrogen fertility are necessary for producing high-quality turfgrasses, quick, reliable methods of determining the N status of turfgrasses would be valuable management tools. The objective of this study was to evaluate the capacity of a hand-held chlorophyll meter (SPAD-502) to provide a relative index of chlorophyll concentrations, N concentrations, and visual quality in St. Augustinegrass [Stenotaphrum secondatum (Walt.) Kuntzel]. Two experiments were conducted in a greenhouse in 1998 to evaluate the utility of SPAD readings. Established pots of 'Floratam' were subjected to weekly foliar Fe treatments at Fe rates of 0 and 0.17 kg·ha⁻¹ for 4 weeks. Six weekly nitrogen fertilizer treatments were applied in the form of ammonium sulfate at N rates of 0, 5.75, 11.5, 17.25, and 23 kg·ha⁻¹ for 4 weeks. Greenhouse SPAD readings were not affected by Fe treatment, but N treatments resulted in differences in SPAD readings, visual quality, and chlorophyll concentrations. The readings were positively correlated with chlorophyll concentrations (r²=0.79), visual ratings (r²=0.74), and total Kjeldahl nitrogen (TKN) (r²=0.71). Readings taken from field-grown 'Floratam', 'Floratine', and 'Floralawn' St. Augustinegrass were poorly correlated (r²<0.63) with chlorophyll concentrations and TKN. Unless future techniques improve dependability of the SPAD meter under field conditions for measuring chlorophyll and N concentration of a stand of turfgrass, the usefulness of such readings for the management of St. Augustinegrass seems limited."
Language:English
References:13
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Rodriguez, I. R., and G. L. Miller. 2000. Using a chlorophyll meter to determine the chlorophyll concentration, nitrogen concentration, and visual quality of St. Augustinegrass. HortScience. 35(4):p. 751-754.
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DOI: 10.21273/HORTSCI.35.4.751
Web URL(s):
https://journals.ashs.org/hortsci/view/journals/hortsci/35/4/article-p751.xml?rskey=YB0R53
    Last checked: 11/14/2019
    Requires: PDF Reader
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MSU catalog number: SB 1 .H64
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