Full TGIF Record # 56914
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DOI:10.1111/j.1469-8137.1998.00283.x
Web URL(s):http://onlinelibrary.wiley.com/doi/10.1111/j.1469-8137.1998.00283.x/pdf
    Last checked: 01/17/2014
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Publication Type:
i
Refereed
Author(s):Bailey, J. S.
Author Affiliation:Department of Agriculture for Northern Ireland, Agricultural and Environmental Science Division, Newforge Lane. Belfast BT9 5PX
Title:Varying the ratio of ¹⁵N - labelled ammonium and nitrate - N supplied to perennial ryegrass: Effects on nitrogen absorptioon and assimilation, and plant growth
Source:New Phytologist. Vol. 140, No. 3, November 1998, p. 505-518.
Publishing Information:Oxford, England: Cambridge University Press.
# of Pages:14
Related Web URL:http://onlinelibrary.wiley.com/doi/10.1111/j.1469-8137.1998.00283.x/abstract
    Last checked: 01/17/2014
    Notes: Abstract only
Keywords:TIC Keywords: Lolium perenne; Fertilizer types; Ammonia; Nitrates; Nitrogen uptake; Shoot growth; Root growth
Abstract/Contents:"A detailed study was carried out to obtain information on the relative rates of NH₄⁺ and NO₃⁻ - N uptake and assimilation by perennial ryegrass (Lolium perenne L.), when grown in soil and supplied with different ratios of NH₄⁺ and NO₃⁻ -N. Following two preliminary defoilations, plants were supplied with ¹⁵N - (differentially) labelled NH₄⁺ and NO₃⁻ in three different ratios (20:80, 50:50 and 80:20), followed by sequential destructive harvests of shoots and roots taken at four points during a 35-d regrowth period. When supplied with equimolar concentrations of NH₄⁺ and NO₃⁻ -N, perennial ryegrass absorbed both forms of nitrogen at almost identical rates; and even when the two N forms were supplied in widely disproportionate concentrations, both forms appear to have been absorbed at equal rates, at least until the supply of the minor nitrogen component in each treatment was exhausted. i.e. by day 3 of regrowth. exhausted, i.e. by day 3 of regrowth. It is suggested that this matching of NH₄⁺ and NO₃⁻ -N absorption rates by plants maximizes the advantages and minimizes the disadvantages associated with the exclusive use of either form of nitrogen, and thereby optimizes the potential for vegetative and reproductive regeneration. Fifteen days after application of ¹⁵N - labelled fertilizer, shoot and root yields differed little between treatments. However, plants grown with NH₄⁺ and NO₃⁻ -N at a ratio of 50:50 had accumulated significantly more root (soluble) carbohydrate than those in the other two treatments. Consequently, when subjected to defoilation at day 15, these former plants were clearly in the best position to re-mobilize root carbohydrate and initiate shoot regeneration. However, further work is needed in order to determine whether or not this finding holds true for plants subjected to a multiple (bi- to tri-weekly) defoilation regime, e.g. in a grazing situation."
Language:English
References:34
Note:Figures
Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bailey, J. S. 1998. Varying the ratio of ¹⁵N - labelled ammonium and nitrate - N supplied to perennial ryegrass: Effects on nitrogen absorptioon and assimilation, and plant growth. New Phytol. 140(3):p. 505-518.
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DOI: 10.1111/j.1469-8137.1998.00283.x
Web URL(s):
http://onlinelibrary.wiley.com/doi/10.1111/j.1469-8137.1998.00283.x/pdf
    Last checked: 01/17/2014
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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MSU catalog number: QK 1 .N38
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