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| Publication Type:
| Refereed |
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| Author(s): | Paterson, Eric;
Sim, Allan |
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| Author Affiliation: | Plants Group, The Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen, UK |
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| Title: | Rhizodeposition and C-partitioning of Lolium perenne in azenic culture affected by nitrogen supply and defoliation |
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| Source: | Plant and Soil. Vol. 216, No. 1/2, 1999, p. 155-164. |
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| Publishing Information: | Dordrecht, Netherlands: Kluwer Academic Publishers |
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| # of Pages: | 10 |
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| Related Web URL: | http://link.springer.com/article/10.1023/A%3A1004789407065
Last checked: 10/14/2015
Notes: Abstract only |
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| Keywords: | TIC Keywords: Lolium perenne; Nitrogen; Defoliation; Carbon; Partitioning; Roots; Morphology; Root length; Grasslands; Uptake; Dry weight; Root-shoot ratio; Root weight; Nitrogen fertilization; Nitrogen partitioning
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| Abstract/Contents: | "The study investigated the effects of N-supply and partial defoliation on C-partitioning, root morphology and soluble rhizodeposition, for Lolium perenne grown in axenic sand culture systems percolated with nutrient solution. Plants were grown for 36 d in nutrient solutions with differing N concentrations (4mM or 0.02 mM NH₄ + NO₃-), and effects of repeated defoliation to 4 cm were determined. The 'low N' supply reduced (P < 0.05) dry matter accumulation, with proportionately increased partitioning to the root systems. Root morphology was also altered at 'low N', with development of a finer root system, manifest as increased (P < 0.05) specific root length. Concurrent with these effects on growth of L. perenne, 'low N' increased (P < 0.05) exudation of C-compounds from roots on a per g root basis. Defoliation was found to increase exudation (P < 0.05) of soluble compounds for periods of 3-5 d following each cut, at both N-supply rates. The effects of N-supply and defoliation are of importance in understanding the coupling of plant productivity to nutrient cycling in soils with differing N availabilities and for grassland systems which are subject to grazing." |
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| Language: | English |
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| References: | 45 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Paterson, E., and A. Sim. 1999. Rhizodeposition and C-partitioning of Lolium perenne in azenic culture affected by nitrogen supply and defoliation. Plant Soil. 216(1/2):p. 155-164. |
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