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Critical Nitrate-N Concentrations for Growth of Two Strains of Idaho Fescue

Lynn O. Hylton and Albert Ulrich
Journal of Range Management
Vol. 21, No. 5 (Sep., 1968), pp. 321-325
DOI: 10.2307/3895903
Stable URL: http://www.jstor.org/stable/3895903
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Critical Nitrate-N Concentrations for Growth of Two Strains of Idaho Fescue
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Abstract

Nitrate-N in shoots of different strains of Idaho fescue, Festuca idahoensis, can be used for an adequate diagnosis of their respective N statuses at the late vegetative growth stage. The suggested critical nitrate-N concentration for growth of Elmer Idaho fescue, the improved strain used in this study, is 500 ppm of nitrate-N in the shoots, dry basis. The suggested critical nitrate-N concentration for growth of the nonimproved strain is 140 ppm of nitrate-N, dry basis. These critical concentrations are guides that can be used to determine the N status of Idaho fescue on rangelands. Nitrate-N in shoots of Idaho fescue should be above 500 ppm, dry basis, during active vegetative growth, if maximum forage production is desirable.

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