Abstract
We previously reported that application of plant growth-promoting rhizobacteria (PGPR) increased soybean growth and development and, specifically, increased nodulation and nitrogen fixation over a range of root zone temperatures (RZTs) in controlled environment studies. In order to expand on the previous studies, field experiments were conducted on two adjacent sites, one fumigated with methyl bromide and one nonfumigated, in 1994. Two experiments were conducted at each site, one involving combinations of two soybean cultivars and two PGPR strains, the other involving the same factors, but also in combination with two strains Bradyrhizobium japonicum. Soybean grain yield and protein yield were measured. The results of these experiments indicated that co-inoculation of soybean with B. japonicum and Serratia liquefaciens 2-68 or Serratia proteamaculans 1-102 increased soybean grain yield, protein yield, and total plant protein production, compared to the nontreated controls, in an area with low spring soil temperatures. Interactions existed between PGPR application and soybean cultivar, suggesting that PGPRs applied to cultivars with higher yield potentials were more effective. PGPRs applied to the rhizosphere without addition of B. japonicum also increased only leaf area and seed number at the fumigated site. Overall, inoculation of soybean plants with PGPRs in the presence of B. japonicum increased soybean grain yield, grain protein yield, and total plant protein production under short season conditions.
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Dashti, N., Zhang, F., Hynes, R. et al. Application of plant growth-promoting rhizobacteria to soybean (Glycine max [L.] Merr.) increases protein and dry matter yield under short-season conditions. Plant and Soil 188, 33–41 (1997). https://doi.org/10.1023/A:1004295827311
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DOI: https://doi.org/10.1023/A:1004295827311