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| Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/bctests/reports/2005/T001.pdf
Last checked: 11/09/2016
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | Ebdon, J. S. |
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| Author Affiliation: | Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, Massachusetts |
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| Title: | Effects of nitrogen and potassium fertilization on brown patch and Typhula blight (gray snow mold), 2002-2003 |
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| Source: | Biological and Cultural Tests for Control of Plant Diseases. Vol. 20, 2005, p. [1]. |
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| Publishing Information: | St. Paul, MN: The American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Nitrogen fertilization; Potassium; Brown patch; Shoot growth; Diseases; Disease control; Typhula blight; Disease severity; Nitrogen
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| Abstract/Contents: | "Nitrogen (N) and potassium (K) effects on diseases severity in perennial ryegrass 'Palmer II' lawn turf was evaluated near Amherst, MA. The test consisted of 15 N-K combinations with 5 rates levels of N (1,3,5,7, and 9 lb/1000 sq ft/yr) and 3 rate levels of K (1,5, and 9 lb/1000 sq ft/yr) applied to 5 ft x 10 ft plots. Urea (46-0-0) was used as the N source and potassium sulfate (0-0-50) as the K source. Treatments were initiated in April 1999 and arranged as a complete factorial. The experimental design was a randomized complete block with four replications. Plots received 60% of the total annual N (with K) in the fall (early September to late November) and the balance in the spring (April to June). No irrigation or fungicides were applied and plots were mowed at 1.25 in. Early snowfall (late December 2002 and 2003) and continuous snow cover (snowmelts 5 Apr 02 and 22 Mar 03) were favorable for snow mold disease. Plots were rated for gray snow mold 6 Apr 02 and 23 Mar 03 and for brown patch disease 24 Jun 02 and 8 Aug 03. Identity of disease was confirmed by the Uniformity of Massachusetts Turfgrass Disease Diagnosis Laboratory. Shoot growth was measured monthly from April to August during 2002 and 2003 from leaf growth accumulated following mowing events. Shoot growth is reported averaged over month and year. Brown patch and gray snow mold severity were evaluated using visual ratings recorded as percent of plot. Significant differences among N-K treatments were detected in both years. No significant interaction with years was detected in disease severity, so data reported as means averaged over year. A significant (positive) correlation was observed between the rate of shoot growth and damage from brown patch (r=0.92, P<0.001) and gray snow mold (r=0.65, P<0.01). Shoot growth and disease severity increased with N, however, responses to K were dependent on the rate of N applied. Increases in growth rate and disease severity with K were only observed when K were dependent on the rate of N applied. Increases in growth rate and disease severity with K were only observed when K was applied in the combination with high N rates (7 to 9 lb/1000 sq ft/yr). Brown patch severity increased with K by as much as 140% and Typhula blight increased with K by as much as 35%. Potassium had no effect on either disease severity or the rate of shoot growth when applied in combination with low to moderate rates of N (1 to 5 lb/1000 sq ft/yr)." |
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| Language: | English |
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| References: | 0 |
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| See Also: | See also related article "Was this year's snow mold enhanced by late-season fertility?" UNL Turfgrass Extension - University of Nebraska - Lincoln, March 28, 2010, p. [1] R=179578 R=179578 |
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| See Also: | Other items relating to: Potassium |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ebdon, J. S. 2005. Effects of nitrogen and potassium fertilization on brown patch and Typhula blight (gray snow mold), 2002-2003. Biol. Cult. Tests Control Plant Dis. 20:p. [1]. |
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| Web URL(s):
https://www.plantmanagementnetwork.org/pub/trial/bctests/reports/2005/T001.pdf
Last checked: 11/09/2016
Requires: PDF Reader |
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MSU catalog number: SB 975 .B5 |
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