Abstract
The count and growth dynamics of amylolytic microorganisms in soil beyond rhizosphere and within rhizosphere as well as in potato rhizoplane was compared in ecological (organic) and conventional farming systems. Potatoes in the ecological system were fertilized only with organic fertilizers and in the conventional system NPK fertilizers + manure were used. The results showed that the count of bacteria showing amylolytic activity was generally higher in ecological farming than in conventional one. Vegetation stage had a significant effect on the growth dynamics of microorganisms tested. The highest level of their count was achieved at the end of the vegetation during tuber harvest maturity. A remarkable smaller count of microorganisms secreting amylases was recorded in the soil beyond rhizosphere in comparison with the rhizosphere area and rhizoplane. Selected physico-chemical properties of soils (humidity and pH) were more favourable in the soil cultivated under organic farming system in comparison to the conventional one.
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