Word: rhizobium
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Dates: during 1976-1976
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NITROGEN FIXATION. At present only legumes such as peas, beans and alfalfa-with the aid of a soil-dwelling bacterium called rhizobium-are known to be naturally capable of fixing nitrogen from the air-joining it to other substances to form compounds necessary for plant growth. Most other plants must obtain their nitrogen from natural and man-made fertilizers. But scientists are seeking to give more plants this nitrogen-fixing ability. At Utah's Brigham Young University, biologists are attempting to "infect" other species of plants with rhizobia. Scientists in England have isolated the segment of the rhizobial...
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