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Journal of the American College of Nutrition, Vol. 23, No. 6, 751S-753S (2004)
Published by the American College of Nutrition

Magnesium-Content of Rhizobium Nodules in Different Plants: The Importance of Magnesium in Nitrogen-Fixation of Nodules

Sandor A. Kiss, PhD, Eva Stefanovits-Bányai, PhD and Maria Takács-Hájos, PhD

Hungarian Magnesium Society, Szeged (S.A.K.)
Szent István University, Faculty of Food Science, Department of Applied Chemistry, Budapest (E.S.-B.)
Tessedik Sámuel College Agricultural Water and Environment Management Department, Szarvas (M.T.-H.), HUNGARY

Address reprint requests to: Eva Stefanovits-Bányai, PhD, Szent István University, Faculty of Food Science, Department of Applied Chemistry (E.S.-B.), H-1118 Budapest, Villányi str. 29-31, Hungary, HUNGARY. E-mail: eva.banyai{at}uni-corvinus.hu

Objective: Rhizobium bacteria induce nodules (tumors) in roots of leguminous crops that fix nitrogen (N2) from the atmosphere.

Methods: Trials were carried on in sterile perlite where two species of peas were grown hydroponically, and in two different soil types (brown forest soil and meadow silt soil), in a field where different leguminous plants were chosen for test plants: lupin, soybean, broad-bean, lentil and bean inoculated by Rhizobium bacteria. The Mg-content of the nutrient solution was higher than that of the control, but in the soil tests 1% Mg leaf fertilization was applied after bacterial inoculation. Number, weight and Mg-content of nodules were evaluated using an AAS method compared with the thick and thin hair/roots of the given plant.

Results and Conclusions: Our results clearly show that the Mg nutrition treatment increased the number of Rhizobium nodules and their Mg-content, resulting in increased N2-fixation and yield.

Key words: Rhizobium bacteria, magnesium, nitrogen fixation, leguminous plants






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