title: [Survival of Bradyrhizobium japonicum strain 646a introduced into soil of the soybean, common bean and maize rhizosphere].
abstract: The number dynamics of Bradyrhizobium japonicum strain 646a introduced into soil in the soybean, common bean and maize rhizosphere and its dependence on inoculum doses have been studied in greenhouse experiments. It was shown that B. japonicum number in the maize, common bean and soybean rhizosphere depends on the inoculum doses (r = 0.79-0.95). It was less than 0.1% of total saprophytic bacteria number and it had no essential effect on this plant productivity. The soybean symbiosis with nodule bacteria enhanced its yield by 28.9-42.6%. In nodulating soybean rhizosphere B. japonicum reproduced most intensively and reached the maximum number 52-225 thousand bacteria/g of soil in the period of soybean maturing and nodule destruction. This indicated to important role of soybean nodules not only in symbiotic nitrogen fixation, but also in formation of the rhizosphere and soil B. japonicum population.
authors: South Branch of the Institute of Agricultural Microbiology, Ukrainian Academy of Agrarian Sciences.
authors: N Z
authors: NZ
authors: Tolkachev
mesh_terms: D000383:Agriculture; D020369:Bradyrhizobium / Q000254:growth & development / Q000502:physiology*; D015169:Colony Count, Microbial; D007887:Fabaceae / Q000254:growth & development / Q000382:microbiology*; D012988:Soil Microbiology; D013025:Glycine max / Q000254:growth & development / Q000382:microbiology*; D013559:Symbiosis; D003313:Zea mays / Q000254:growth & development / Q000382:microbiology*