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| Publication Type:
| Refereed |
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| Author(s): | Bowman, D. C.;
Paul, J. L.;
Davis, W. B. |
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| Author Affiliation: | Dept. of Environmental Horticulture, U of California |
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| Title: | Nitrate and Ammonium Uptake by Nitrogen-deficient Perennial Ryegrass and Kentucky Bluegrass Turf. |
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| Source: | Journal of the American Society for Horticultural Science. Vol. 114, No. 3, May 1989, p. 421-426. |
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| Publishing Information: | Westport, CT: AVI Publishing Co. |
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| Keywords: | TIC Keywords: Poa pratensis; Lolium perenne; Mowing; Uptake
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| Abstract/Contents: | "Nitrogen uptake by two N-deficient turfgrass species was characterized by measuring N depletion from a complete nutrient solution. The uptake rate of both NO-3 and NH+4 was enhanced up to 6-fold in N-deficient perennial ryegrass (Lolium perenne L.) compared to N-sufficient controls, reaching a maximum of about 0.3 and 0.4 g N/m2 per hr for NO-3 and NH+4, respectively. Deficiency-enhanced uptake exceeded uptake by controls for about 72 hr following resupply of N. Nitrogen uptake was enhanced to a similar degree by N deprivation in Kentucky bluegrass (Poa pratensis L.) Mowing had no effect on NO-3 uptake by deficient perennial ryegrass turf, whereas mowing inhibited uptake by N-sufficient turf by ~60%. Deficiency-enhanced uptake was found to be the result of an increased capacity for N absorption (Imax) rather than an increased affinity for N (Km). Imax values increased from 0.24 and 0.73 mg N/g dry weight per hr for N-sufficient ryegrass turf for NO-3 and NH+4, respectively, to 1.44 and 2.68 mg N/g dry weight per hr for N-deficient turf. Km values increased slightly, from 14 micrometers for both N forms for N-sufficient turf to 24 and 39 micrometers for NO-3 and NH+4, respectively, for N-deficient turf." |
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| Language: | English |
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| References: | 32 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bowman, D. C., J. L. Paul, and W. B. Davis. 1989. Nitrate and Ammonium Uptake by Nitrogen-deficient Perennial Ryegrass and Kentucky Bluegrass Turf.. J. Am. Soc. Hortic. Sci. 114(3):p. 421-426. |
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