Full TGIF Record # 111993
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Web URL(s):https://journals.ashs.org/hortsci/view/journals/hortsci/40/3/article-p842.xml?rskey=2aBYO2
    Last checked: 11/20/2019
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Author(s):Webster, D. E.; Ebdon, J. S.
Author Affiliation:Department of Plant, Soil, and Insect Sciences, University of Massachusetts, Amherst, Massachusetts
Title:Effects of nitrogen and potassium fertilization on perennial ryegrass cold tolerance during deacclimation in late winter and early spring
Section:Turf management
Other records with the "Turf management" Section
Source:HortScience. Vol. 40, No. 3, June 2005, p. 842-849.
# of Pages:8
Publishing Information:Alexandria, VA: American Society for Horticultural Science
Keywords:TIC Keywords: Nitrogen fertilizers; Potassium fertilizers; Lolium perenne; Cold resistance; Deacclimation; Winter; Spring; Winter injury; Application rates; Cold stress
Abstract/Contents:"Turf loss from freezing injury results in costly re-establishment, especially with turfgrasses such as perennial ryegrass (Lolium perenne L.) having poor low-temperature hardiness. Studies are limited as to the influence of N and K on cold tolerance during de-hardening periods in late winter when grasses are most susceptible to freezing injury. The objective of this study was to evaluate perennial ryegrass low temperature hardiness during deacclimation in response to N and K and associated effects on crown hydration, median killing temperature (LT50), shoot growth rate, tissue K concentration, soil exchangeable K, and low temperature disease. Treatments included five rate levels of N (49, 147, 245, 343, and 441 kg路ha-1路yr-1) in all factorial combinations with 3 rate levels of K (49, 245, and 441 kg路ha-1路yr-1. Low temperature tolerance was assessed using whole plant survival and electrolyte leakage (EL). Interactions between N and K were detected for all field measurements. The effects of N and K on survival LT50 were detected only during late winter periods in February 2004, N and K differences were lost by March. Late winter cold survival was negatively correlated with crown moisture, growth rate, and tissue K. Tissue K concentrations ranged from 28.6 to 35.9 g路kg-1 DM while soil K ranged from 121 to 261 mg路kg-1. Soil extractable K was not correlated with tissue K. Survival and EL LT50 were uncorrelated due to N and K interaction. Survival LT50 ranged from -9.0 to -13.6 掳C. Maximum cold hardiness occurred when low to moderate N (49 to 147 kg路ha-1路yr-1) was applied with medium-high to high levels of K (245 to 441 kg路ha-1路yr-1), which corresponded to soil exchangeable K levels ranging from 200 to 260 mg路kg-1. Alternatively, similar K fertilization and soil K levels combined with high rates of N (343 and 441 kg路ha-1) increased freeze stress and low temperature fungi (Typhula incarnatae). At N rates routinely applied to perennial ryegrass, higher soil extractable K beyond those levels currently recommended for optimum shoot growth could provide some benefit in enhancing cold hardiness. Late fall applied N did not appear to increase the potential for winter injury."
Partial reprint appears in Cornell University Turfgrass Times, Vol. 17, No. 1, 2006, page 3, with variant title "N, K and Winter Hardiness"
See Also:Other items relating to: Potassium
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Webster, D. E., and J. S. Ebdon. 2005. Effects of nitrogen and potassium fertilization on perennial ryegrass cold tolerance during deacclimation in late winter and early spring. HortScience. 40(3):p. 842-849.
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DOI: 10.21273/HORTSCI.40.3.842
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    Last checked: 11/20/2019
    Requires: PDF Reader
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MSU catalog number: SB 1 .H64
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