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Effect of Nitrogen Status on Salinity Tolerance of Tall Fescue Turf 

Authors: Daniel C. Bowman a;  Grant R. Cramer b; Dale A. Devitt c
Affiliations:   a Department of Crop Science, North Carolina State University, Raleigh, NC, USA
b Department of Biochemistry, University of Nevada, Reno, NV, USA
c Department of Environmental and Resource Science, University of Nevada, Reno
DOI: 10.1080/01904160600837600
Publication Frequency: 14 issues per year
Published in: journal Journal of Plant Nutrition, Volume 29, Issue 8 August 2006 , pages 1491 - 1497
Formats available: HTML (English) : PDF (English)
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Abstract

Turfgrass salinity tolerance is usually studied under conditions of non-limiting nutrition, even though most turfgrasses are managed with growth-limiting levels of nitrogen (N). This study examined the effect of N status (replete versus deficient) on salinity tolerance in tall fescue (Festuca arundinacea Schreb.). Additionally, the interactive effects of N status and salinity on tissue ion concentrations were determined. Two cultivars ('Monarch' and 'Finelawn I') were grown in nutrient solution culture. Treatments included N level (100% or 25% of maximum N demand) and salinity (0, 40, 80, 120 meq L-1). Salinity reduced leaf growth under high-N conditions, but much less so under low-N conditions. Concentrations of potassium (K), sodium (Na), and chloride (Cl) in the leaf sap were significantly higher in low-N than in high-N plants, indicating that increased salinity tolerance in low-N turf was not due to ion exclusion. These results suggest that efforts to screen turfgrasses for salt tolerance should be conducted using realistic N-fertility levels.
Keywords: Nitrogen deficiency; ion accumulation
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