Nitrogen fixation by soybeans (Glycine max L.) in Zambia |
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Authors: | K. Munyinda Dr R. E. Karamanos J. O. Legg S. Sanogho |
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Affiliation: | (1) Department of Renewable Resources, Macdonald College of McGill University, Ste. Anne de Bellevue, H9X 1CO Quebec;(2) Department of Soil Science, University of Saskatchewan, S7N OWO Saskatton, Sask, Canada;(3) 2400 W. New Hope Rd, 72756 Rogers, AR, USA |
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Abstract: | Soybeans (Glycine max L.) are being introduced as a cash crop to small scale farmers in Zambia for rotation in their farming systems. The objectives of this study were to compare and select the most approriate non-fixing reference crop for estimating N2 fixation by soybeans and assess yields and N2 fixation of soybeans in Zambia. Nitrogen isotope dilution techniques using15N-labelled organic or inorganic materials were utilized. Two nonnodulating soybean cultivars, Clark RJ1 and N77 or in their absence Pearl millet (Panicum glaucum L.) were judged to be appropriate reference crops. A local soybean fixing cultivar (Glycine max L. cv. Magoye) rated highest among three cultivars tested for its ability to support symbiotic N2 fixation byB. japonicum under the experimental conditions. Values of percent N derived from atomosphere for this cultivar were in the order of 65 to 70%.deceased.Contribution no R531 of the Saskatchewan Institute of Pedology. Present address (REK): Esso Chemical Canada, P.O. Box 3010, Lethbridge, Alberta Canada T1J 4A9. |
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Keywords: | Bradyrhizobium japonicum dinitrogen fixation 15N dilution Panicum glaucum plant N uptake |
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