New Zealand Journal of Agricultural Research abstracts

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Elevated atmospheric CO2 concentration and rhizosphere nitrogen fixation in four forage plants

J. R. CRUSH

AgResearch Grasslands
Private Bag 11008
Palmerston North, New Zealand

Present address: AgResearch, Ruakura Agricultural Research Centre, Private Bag 3123, Hamilton, New Zealand.

Abstract  Lolium x boucheanum (2n and 4n), Plantago lanceolata, and Pennisetum clandestinum were grown in pots of soil in growth rooms with factorial combinations of 350 or 700 ul/l atmospheric CO2 and day/night temperatures of 28/23deg.C or 18/13deg.C. Both cultivars of Lolium and P. lanceolata grew faster with elevated CO2 but P. clandestinum was unaffected. Rhizosphere nitrogenase activity, assessed by acetylene reduction, was reduced by the 700 ul/l CO2 treatment in the tetraploid Lolium but otherwise did not vary significantly with CO2 level.

Keywords  acetylene reduction; carbon dioxide; Lolium x boucheanum; nitrogen; nitrogenase; Pennisetum clandestinum; Plantago lanceolata; rhizosphere; roots

New Zealand Journal of Agricultural Research, 1994, Vol. 37: 455-463

0028-8233/94/3704-0455 $2.50/0 (c) The Royal Society of New Zealand 1994

PDF file of entire paper: medium quality (657K); (scanned from paper original: notes about this process)

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