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| Web URL(s): | https://scisoc.confex.com/scisoc/2016am/webprogram/Paper99639.html
Last checked: 11/22/2016 |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Schmid, Charles J.;
Murphy, James A.;
Clarke, Bruce B. |
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| Author Affiliation: | Schmid: Rutgers University, New Brunswick, NJ; Murphy and Clarke: Department of Plant Biology and Pathology, Rutgers University, New Brunswick, NJ |
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| Title: | Annual bluegrass response to potassium and calcium fertilization and soil pH |
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| Section: | 5 minute rapid - USGA/GCSAA sponsored research
Other records with the "5 minute rapid - USGA/GCSAA sponsored research" Section
C05 turfgrass science
Other records with the "C05 turfgrass science" Section
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| Meeting Info.: | Phoenix, Arizona: November 6-9, 2016 |
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| Source: | ASA, CSSA and SSSA International Annual Meetings. 2016, p. 99639. |
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| Publishing Information: | [Milwaukee, Wisconsin]: [American Society of Agronomy and the Entomological Society of America] |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Anthracnose; Calcium fertilizers; Disease severity; Fertilizer evaluation; Nutrient concentration; Poa annua; Potassium carbonate; Potassium chloride; Potassium nitrate; Potassium sulfate; Soil pH; Stress tolerance
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| Abstract/Contents: | "Potassium fertilization has been shown to improve abiotic stress tolerance in turfgrass; however, its effect on turfgrass diseases has been inconsistent and not well understood. A 3-yr field study was initiated in 2012 to determine the impact of K fertilization rate and K source on anthracnose disease of annual bluegrass turf. Treatments were arranged as a 2 x 3 factorial with four replications. Potassium chloride (KCl) and potassium sulfate (K2SO4) were applied at rates of 54, 109, and 218 kg K ha-1 yr-1. Potassium nitrate (KNO3) and potassium carbonate (K2CO3) were also included at the 218 kg K ha-1 yr-1 rate, as well as an untreated check. All K treatments reduced disease severity compared to the untreated check (no K), regardless of K rate or K source; however, KCl applied at 218 kg K ha-1 yr-1 was slightly less effective at reducing disease severity than all other sources applied at the same rate during August 2013 and throughout 2014. Critical mat K and leaf K concentrations needed to reduce anthracnose severity were calculated using nonlinear regression models (Cate-Nelson, linear plateau, and quadratic plateau). All regression models provided an acceptable fit and predicted critical values for mat K between 43 to 70 mg K kg-1 (Mehlich 3). Only the Cate-Nelson and linear plateau models provided an adequate fit and critical value for leaf K with respect to anthracnose severity (AUDPC); critical leaf K values ranged from 17.3 to 28.6 g kg-1. The potassium fertilization effect on turf quality was similar to the disease severity response, with K fertilization improving turf quality. Turf color, NDVI, and chlorophyll index were either not affected by K or only minor improvements were observed from K fertilization." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only!
"300-7" |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Schmid, C. J., J. A. Murphy, and B. B. Clarke. 2016. Annual bluegrass response to potassium and calcium fertilization and soil pH. Agron. Abr. p. 99639. |
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Last checked: 11/22/2016 |
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