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DOI: | 10.1139/b83-234 |
Web URL(s): | http://www.nrcresearchpress.com/doi/pdf/10.1139/b83-234 Last checked: 07/18/2012 Requires: PDF Reader Access conditions: Item is within a limited-access website |
Publication Type:
| Refereed |
Author(s): | Montes, Ruben A.;
Blum, Udo;
Heagle, Allen S.;
Volk, Richard J. |
Author Affiliation: | Montes and Blum: Department of Botany; Heagle: Agriculture Research Service, United States Department of Agriculture and Department of Plant Pathology; Volk: Department of Soil Science, North Carolina State University, Raleigh, NC |
Title: | The effects of ozone and nitrogen fertilizer on tall fescue, ladino clover, and a fescue-clover mixture. II. Nitrogen content and nitrogen fixation |
Source: | Canadian Journal of Botany. Vol. 61, No. 8, 1983, p. 2159-2168. |
Publishing Information: | Ottawa: National Research Council |
Related Web URL: | http://www.nrcresearchpress.com/doi/abs/10.1139/b83-234 Last checked: 07/18/2012 Notes: Abstract only |
Keywords: | TIC Keywords: Trifolium repens; Air pollution; Ozone; Festuca arundinacea; Fertilizers; Mixtures; Grasses; Nitrogen fixation; Legumes; Pollution; Trifolium; Festuca; Nitrogen fertilizers; Isotope dilution
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Abstract/Contents: | "The effects of chronic doses of ozone (O3) and rates of nitrogen (N) fertilizer on N content of ladino clover (Trifolium repens L. cv. Tillman) and tall fescue (Festuca arundinacea Schreb. cv. Kentucky 31), and on N fixation by the clover were studied during the 1979 growing season. Plants of the two species were grown (i) in pots separately, (ii) together in open-top field chambers, and (iii) in ambient air plots. Mean 7 h/day (0930-1630 h eastern daylight time) O3 concentrations for the study period were 0.03 ppm in charcoal-filtered air chambers, 0.05 ppm in nonfiltered air chambers, 0.08 ppm in nonfiltered air chambers with O3 added for 7 h/day, and 0.05 ppm in ambient air. Shoot N concentrations (milligrams per gram dry weight) for clover and fescue were not modified by O3 exposures nor by N fertilization. Higher ozone levels led to reduced system N fixation (milligrams N per pot) by clover grown separately or together with fescue. Nitrogen fixation by ladino clover grown with tall fescue was 1.4 times greater than that by the clover grown alone. Nitrogen fixation by clover as estimated by the difference method was approximately 45% lower than N fixation as estimated by the 15N dilution method. Nitrogen fixation estimated by the difference method declined significantly with increasing N fertilization. This was not the case for N fixation estimated by the 15N dilution method." |
Language: | English |
References: | 15 |
Note: | Summary also appears in French |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Montes, R. A., Udo Blum, Allen S. Heagle, and R. J. Volk. 1983. The effects of ozone and nitrogen fertilizer on tall fescue, ladino clover, and a fescue-clover mixture. II. Nitrogen content and nitrogen fixation. Can. J. Bot. 61(8):p. 2159-2168. |
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| DOI: 10.1139/b83-234 |
| Web URL(s): http://www.nrcresearchpress.com/doi/pdf/10.1139/b83-234 Last checked: 07/18/2012 Requires: PDF Reader Access conditions: Item is within a limited-access website |
| MSU catalog number: QK 1 .C3 |
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