Full TGIF Record # 54478
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Web URL(s):http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2494.1998.5320170.x/epdf
    Last checked: 10/02/2015
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Publication Type:
i
Refereed
Author(s):Thornton, B.
Author Affiliation:Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen, UK
Title:Influence of pH and aluminium on nitrogen partitioning in defoliated grasses
Source:Grass and Forage Science. Vol. 53, No. 2, June 1998, p. 170-178.
# of Pages:9
Publishing Information:Oxford, Blackwell Scientific Publications
Keywords:TIC Keywords: Aluminum; Nitrogen; Defoliation; Fertilizers; Leaves; Lolium perenne; Deschampsia flexuosa; pH; Lime
Abstract/Contents:"Reduced inputs of fertilizer and lime to grasslands can result in decreased soil pH, increased aluminium concentration in the soil solution and, consequent upon these, inhibition of nitrogen acquisition by plants. This study tested the hypothesis that under conditions of low pH and high aluminium concentrations a grass species more tolerant of acid conditions (Deschampsia flexuosa) maintains a greater total supply of nitrogen to growing leaves after defoliation from both root uptake and mobilization of stores than a less tolerant species (Lolium perenne). The grasses were grown with aluminium at pH values 3.5, 4.0, 4.5, 5.0, or 5.5 and at a range of aluminium concentrations (0, 20, 100, 200 or 1000 mmol⁻³ at pH 4.5. Labeling with ¹⁵NH₄ ¹⁵NO₃ after defoliation allowed estimation of both root uptake and mobilization of stores in supplying nitrogen to growing leaves. The total amount of nitrogen supplied by growing leaves after defoliation by the combination of current root uptake and mobilization was maximal when aluminium was in the range 20-200 mmol⁻³. The total nitrogen supplied to the growing leaves of both species after defoliation was greater when the grasses were grown at pH 5.0 and 5.5 then when grown at pH 4.0. L. perenne and D. flexuosa were affected similarly by both aluminium and pH with respect to the total nitrogen supplied to the leaves. The effects of aluminium and pH upon the supply of nitrogen to growing leaves after defoliation may not be a dominant factor in the vegetation dynamics of grazed swards."
Language:English
References:35
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Thornton, B. 1998. Influence of pH and aluminium on nitrogen partitioning in defoliated grasses. Grass Forage Sci. 53(2):p. 170-178.
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Web URL(s):
http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2494.1998.5320170.x/epdf
    Last checked: 10/02/2015
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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