[The Rhizobium-Prosopis symbiosis in the Argentinian Chaco Arido].
Low productivity soils can be improved by incorporation of adapted legumes species able to increase the nitrogen fixation when associated to Rhizobium strains. Two fast-growing Rhizobium strains were isolated from nodules of Prosopis alba. Infectivity and effectivity of the strains were assessed under controlled conditions, measuring the following parameters: nodule number, dry weight, nitrogen percentage and fixed nitrogen. P. flexuosa strains showed high infective capacity (144 nodules/plant) but low effectivity (21.4 mg fixed nitrogen in 75 days). Although nodule number in P. alba was lower (23 nodules/plant) nitrogen fixation was higher (119.5 mg fixed nitrogen in 75 days) as compared with P. flexuosa. The isolated strains might be used as nitrogen donors in aride soils; they might be helpful to forestation of these ecosystems.
Abril
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Facultad de Ciencias Agropecuarias, Universidad Nacional de Córdoba, Argentina.
González
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D001118:Argentina; D007887:Fabaceae / Q000145:classification / Q000382:microbiology*; D009586:Nitrogen Fixation; D010946:Plants, Medicinal; D012231:Rhizobium / Q000302:isolation & purification / Q000502:physiology*; D012988:Soil Microbiology; D013045:Species Specificity; D013559:Symbiosis
La simbiosis Rhizobium-Prosopis en el Chaco Arido argentino.