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Using 15N dilution technique the nitrogen fixing rates were estimated from symbiosis between 20 varities of soybean and 2 species of rhizobia:Bradyrhizqbium japonicum and Sinorhizobium fredii.The nodulation status such as size and number of nodules differed among the varieties and species of bacteria.The Ndfa% of these varieties ranged from 40%~59% for S.fredii,38%-62% for B.japonicum and 32%~56% for inoculant of both species mixture,respectively.Among 3 inocu-lants the B.japonicum is the best one.The variety of soybean,however,plays significant role in the symbiosis.Therefore,improving the soybean and selecting a good partner for rasing the yield and nitrogen fixation are of importance.
Using 15N dilution technique the nitrogen fixing rates were estimated from symbiosis between 20 varities of soybean and 2 species of rhizobia: Bradyrhizqbium japonicum and Sinorhizobium fredii. Nodulation status such as size and number of nodules differed among the varieties and species of bacteria. Ndfa % of these varieties ranged from 40% to 59% for S. fredii, 38% -62% for B. japonicum and 32% to 56% for inoculant of both species, respectively. Among 3 inocu-lants the B. japonicum is the best one. variety of soybean, however, plays significant role in the symbiosis.Therefore, improving the soybean and selecting a good partner for rasing the yield and nitrogen fixation are of importance.