TITLE:
Effects of Streptomyces Biofertilizer to Soil Fertility and Rhizosphere’s Functional Biodiversity of Agricultural Plants
AUTHORS:
Tinatin Doolotkeldieva, Saykal Bobusheva, Maxabat Konurbaeva
KEYWORDS:
A Low Fertility Soil, A Biofertilizer, Streptomyces fumanus gn-2, Wheat and Soybean Seeds, Stimulatory Effect on Seed Germination, Rhizosphere’s Functional Biodiversity
JOURNAL NAME:
Advances in Microbiology,
Vol.5 No.7,
July
28,
2015
ABSTRACT: In the present study, a biofertilizer on the basis of Streptomyces fumanus gn-2 was used for
the treatment of wheat and soybean seeds (dose 104 spore/ml) before
planting them in soil with low fertility in order to determine the effect of
this biological agent on germination rate; the growth of seedlings, shoots, and
the maturation phase of plants; the rhizosphere’s functional biodiversity; and
the resistance of these plants to pathogens. Seeds were soaked in the
suspension for a period of two or three hours. During the growing season of the
crop, no additional fertilizing and spraying of a biopesticide against diseases
or pests occurred. Despite the soil having low fertility, low quantities of
organic matter, and not having been before used for the cultivation of
agricultural plants, this biofertilizer showed a strong stimulatory effect on
the growth of seeds and seedlings of wheat and soybeans. The average
germination and seed vigor increased by 1.5 - 2.0 times, and the phenophases
were accelerated to three to five days. In all phases of vegetation, the
ammonifying bacteria in the presence of an antagonist (a biological agent)
developed rapidly and were constantly present in significant numbers in the
rhizosphere. Streptomyces fumanus introduced into non-sterile soil
entered into competition with the local soil microflora and had the ability to
colonize the rhizosphere system of plants. The use of a formulation of Streptomyces
gn-2 has improved the
composition of rhizosphere microflora, attracting saprophytic microorganisms:
ammonificators and oligotrophs. The presence of the biocontrol microorganism Streptomyces
fumanus in the rhizosphere plays an important role in enhancing the growth
and development of useful groups, such as nitrogen-fixing bacteria.