บทคัดย่องานวิจัย

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Inoculants of Azospirillum brasilense: biomass production, survival and growth promotion of Setaria italica and Zea mays.

Fallik, E.; Okon, Y.;

Soil Biology & Biochemistry Year: 1996 Vol: 28 Issue: 1 Pages: 123-126 Ref: 10 ref.

1996

บทคัดย่อ

Inoculants of Azospirillum brasilense: biomass production, survival and growth promotion of Setaria italica and Zea mays.

Azospirillum brasilense biomass was grown in a fed-batch culture for 28 h using succinic acid as a C source and liquid NH3 as the N source. Viable cell concn reached 1-3 x 1010 c.f.u./ml after 28 h. Ground or granular peat, serving as carriers for the bacteria, maintained the highest number of A. brasilense compared to vermiculite, talcum powder, basalt granules or bentonite. A. brasilense viable counts declined from approx equal to 1010 c.f.u./g peat to 105-106 c.f.u./g peat after 6 months. A pot system for evaluating the effect of A. brasilense inoculants on plant growth in greenhouses demonstrated that application of peat carrier containing 108 c.f.u./g peat significantly increased panicle length and dry weight of Setaria italica and ear and kernel weight of maize (Zea mays). Highest growth promotion effects on maize were observed when using A. brasilense cells containing 40% polyhydroxybutyrate and by applying the peat inoculant 2 cm below the maize seed.