Full TGIF Record # 310269
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Web URL(s):https://scisoc.confex.com/scisoc/2019am/meetingapp.cgi/Paper/121609
    Last checked: 02/03/2020
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Koch, Paul L.
Author Affiliation:University of Wisconsin-Madison, Madison, WI
Title:Nitrogen fertilizer influences dollar spot severity through manipulation of the soil microbial community
Section:C05 turfgrass science
Other records with the "C05 turfgrass science" Section

Turfgrass pest management oral II: Diseases, insects, and weeds
Other records with the "Turfgrass pest management oral II: Diseases, insects, and weeds" Section
Meeting Info.:San Antonio, Texas: November 10-13, 2019
Source:ASA, CSSA and SSSA International Annual Meetings. 2019, p. 121609.
Publishing Information:[Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America]
# of Pages:1
Keywords:TIC Keywords: Application rates; Disease control; Disease severity; Dollar spot; Gene expression; Nitrogen fertilizers; Oxalic acid; Soil microorganisms
Abstract/Contents:"Dollar spot is the most economically important disease of golf course turfgrass in temperate climates. Increased rates of nitrogen fertilizer can decrease symptom severity, but the mechanism behind the disease suppression is unclear. We tested five rates (0, 4.88, 9.76, 19.42, and 29.29 kg N ha-1 annually) of nitrogen applied as a biweekly urea liquid application from 2015 through 2018 at sites in Madison, WI and Chicago, IL. Following the third year of the study we sampled the soil from the 0, 4.88, and 29.29 kg N ha-1 at the Madison, WI site and conducted a high-throughput sequencing analysis of the bacterial community. The 3-year nitrogen study found that decreases in dollar spot severity were non-linear with increasing nitrogen rate. Instead, dollar spot severity was consistently high at 0, 4.88, and 9.76 kg N ha-1 annually, dropped marginally at 19.42 kg N ha-1, and dropped to near zero at 29.29 kg N ha-1. The soil bacterial communities in the 29.29 kg N ha-1 plots were found to be markedly different then the communities from the low-nitrogen plots using a principal component analysis. In addition, the 29.29 kg N ha-1 also had higher concentrations of frc gene expression, which has been used as a biomarker for soil degradation of oxalic acid. Oxalic acid has been identified as an important pathogenicity factor in many fungal pathogens, and research suggests it may also be important in dollar spot. These results indicate that heavy nitrogen fertilization alters the soil bacterial community and results in suppression of the dollar spot pathogen."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Koch, P. L. 2019. Nitrogen fertilizer influences dollar spot severity through manipulation of the soil microbial community. Agron. Abr. p. 121609.
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