The use of ecological methods, promoting sustainable technologies with low inputs represents a contemporaneous subject at an international scale. Because of this reason, the adoption of alternatives in maintaining and increasing of soil fertility is a constant concern in this domain. The microorganisms witch improve the fertility status of the soil and contribute to plant growth, have been termed biofertilizers and are receiving worldwide attention for use as microbial inoculants in agriculture. Vessey, 2003, defined biofertilizer as “a substances which contains living microoganisms which, when applied to seed, plants surfaces, or soil, colonizes the rhizosphere or the interior of the plant and promotes growth by increasing the supply or availability of primary nutrients to the host plant. The Papilionaceae group are the most known family of plants that have symbiotic bacteria partnership to meet nitrogen requirements by biological way. In any cultural system for crop legumes, such as principal culture, intercropping, crop rotation, allied crops through utilization of performing symbiotic strains for nitrogen fixation, the improvement of total nitrogen content in soil is assured. The present paper shows results about efficacy and nodulation capacity of selected strains of Bradyrhizobium lupini and Rhizobium phaseoli compared with native strains belong to edaphical microflora. Efficiency was tested by inoculating seed of Lupinus angustifolius with strains LP53, LP73, LP78 and LP83 from the laboratory collection of Soil Biology, Fundulea. For bean, Phaseolus vulgaris were used FsS2, FsS4, FsS6 and FsS9 strains isolated from agricultural perimeter Sîrbova village, Timis County, in summer 2007. After 6 weeks of plant growth was determined stem length, dry biomass accumulation, the number and volume for nodosity.  Strain Lp 78 for lupins and FsS2 for beans proved to be most efficient genotypes, in the same culturally conditions, values recorded on the number, volume of nodosity and accumulation of dry matter / plant exceeding control samples, without bacterial treatment.

Rhizobium stains; efficacy; crop legumes nodosity; total nitrogen content

Presentation: oral