Survival of rhizobia, azotobacter and actinomycetes in soil of different pH values
2005
Jarak, M.,Poljoprivredni fakultet, Novi Sad (Serbia) | Hajnal, T.,Poljoprivredni fakultet, Novi Sad (Serbia) | Djuric, S.,Poljoprivredni fakultet, Novi Sad (Serbia) | Zurkic, J.,Poljoprivredni fakultet, Novi Sad (Serbia)
The survival of rhizobium, azotobacter and actinomycetes was observed in different soil types: chernozem (pH 7.0), humogley (pH 7.2), luvisol (pH 3.9), pseudogley (pH 5.0), and peat (pH 7.1). 40 ml of sterile water was added into control samples. As for other samples, 40 ml of 4 x 10**10/ ml cells of actinomycetes was added, 40 ml 6.9 x 10**8 cells of azotobacter into 1 ml and 40 ml of 4.7 x 10**10 cells into 1 ml of rhizobium mixture (for alfalfa, clover, and lotus). After that, the samples were incubated at 28 deg C and the number of microorganisms was being observed ten, twenty and thirty days later. Rhizobium, azotobacter and actinomycetes have a high survival ability as their number in all the investigated soils was high enough even after 30 days. Rhizobium survives and multiplies most easily in peat, whereas in luvisol its survival is at the least. Azotobacter survives easily in all the investigated soils. Actinomycetes survive most easily in peat and chernozem. In luvisol, their survival is very low.
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