Physiological and ecological characteristics of indigenous soybean Rhizobia distributed in Korea, 5. effects of Co-inoculation of R. japonicum and A. lipoferum on the effectiveness of symbiotic nitrogen fixation with soybean
1988
Ryu, J.C. | Suh, J.S. | Lee, S.K. (Rural Development Adiministration, Suwon (Korea R.). Agricultural Sciences Inst.) | Cho, M.J. (Kyongsang National Univ., Chinju (Korea R.). Coll. of Agriculture)
This experiment was conducted to find out the effects of fertilizer-N and co-inoculation of the Rhizobium japonicum and the Azospirillum lipoferum on nodulation, N2-fixation, and growth of soybean under in situ conditions. The yield of soybean dry matter was significantly greater in the R. japonicum alone and the mixed inoculation of R. japonicum and A. lipoferum than those of no-inoculation. But inoculum applied by different strains did not have a significant effect on plant growth. The effects of nitrogen applied on soybean dry matter were higher in the ammonium sulfate than potassium nitrate, and decreased with increasing rates of two forms of nitrogen applied regardless of nitrogen source. Acetylene reduction activity increased more in a single inoculation of R. japonicum than those of the mixed inoculation of the R. japonicum and the A. lipoferum, in cases of Danyeup cultivar, regardless of the form of combined nitrogen used. Nodule mass and total nitrogenase activity per plant showed the positively significant effect in the interrelationship between dry matter of soybean and some factors related to nitrogen fixation efficiency. The highest symbiotic effect in Danyeup cultivar was obtained when a single R. japonicum 84 Dy-1 strain was inoculated and fertilized with 18 mM potassium nitrate
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