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DOI: | 10.4141/P99-033 |
Web URL(s): | http://pubs.aic.ca/doi/pdfplus/10.4141/P99-033 Last checked: 10/01/2015 Requires: PDF Reader Access conditions: Item is within a limited-access website |
Publication Type:
| Refereed |
Author(s): | Bélanger, G.;
Gastal, F. |
Author Affiliation: | Bélanger: Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada, Sainte-Foy, Québec, Canada; Gastal: Station d'écophysiologie des plantes fourragères, Institut National de la Recherche Agronomique, Lusignan, France. |
Title: | Nitrogen utilization by forage grasses |
Section: | Symposium Other records with the "Symposium" Section
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Meeting Info.: | Vancouver, British Columbia: July 8, 1998 |
Source: | Canadian Journal of Plant Science. Vol. 80, No. 1, January 2000, p. 11-20. |
Publishing Information: | Ottawa: Agricultural Institute of Canada |
# of Pages: | 10 |
Keywords: | TIC Keywords: Nitrogen use; Festuca arundinacea; Nitrogen; Forage; Grasslands; Nitrogen efficiency; Shoot growth; Clipping weight; Models; Nitrogen deficiency; Growth; Biomass; Photosynthesis
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Abstract/Contents: | "The efficient utilization of nitrogen (N) in grass production is essential to reduce the risks of water and air pollution, and the costs of production. Recent findings in grass physiology and agronomy should help in developing new tools to improve N utilization efficiency. A model of N dilution describing the decrease in plant N concentration with increasing shoot biomass under non-limiting N supply is used to define a critical N concentration in grasses required to reach maximum shoot growth and yield. The index of N nutrition (INN) is then calculated as the measured N concentration in a given situation divided by the critical N concentration. The INN is a diagnostic tool to quantify the level of N deficiency during growth cycles, and can also be used in crop modelling and in the interpretation of results from studies conducted over many sites and years. The "universality" of the model of N dilution is based on the increased proportion of structural to metabolic components during crop growth combined with the fact that the structural component has a lower N concentration. Inter- and intra-species differences in N concentration at a given shoot biomass can be related to differences in the proportion of leaves which are assumed to be equivalent to the metabolic component. Under N-deficient conditions, the reduction in grass growth is due to a reduction in the interception of solar radiation primarily through reduced leaf extension, and to a reduction in the conversion efficiency of intercepted radiation into shoot biomass primarily through an effect on biomass partitioning between roots and shoots. The concept of the critical N concentration based on the relationship between plant N concentration and shoot biomass is used to derive general and synthetic expressions of the effect of plant N nurtition on crop growth and crop growth processes. These recent findings on the relationship between N nutrition and the growth of forage grasses should result in the improvement of the efficiency of N utilization by a more precise fertilizer management and the development of more N efficient cultivars." |
Language: | English |
References: | 60 |
Note: | Abstract also appears in French Graphs |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Bélanger, G., and F. Gastal. 2000. Nitrogen utilization by forage grasses. Can. J. Plant Sci. 80(1):p. 11-20. |
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| DOI: 10.4141/P99-033 |
| Web URL(s): http://pubs.aic.ca/doi/pdfplus/10.4141/P99-033 Last checked: 10/01/2015 Requires: PDF Reader Access conditions: Item is within a limited-access website |
| MSU catalog number: SB 1 .C3 |
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