Impact of the biological fertilizers on the microorganisms and the nutrient elements in the soil

The present experimental work is set as a vessel experiment in a non-heated greenhouse of department „Plant Production“, Technical University – Varna. There are used three biological products – Extrasol, Herbagreen, Life Bat Guano and one mineral fertilizer – NPK. It is followed the impact of the fertilizers on the microbiological activity, as there is analyzed and the content of macroelements in the soil. From the carried out analyses is established that the biological fertilizers leave the soil well stocked with nitrogen, movable phosphates and absorbable potassium, as highest results are reported at usage of Extrasol. In the composition of the microbocenosis prevailing are the non-spore forming bacteria, and least are the micromycetes. The activity of the microorganisms is highest at usage of a combination of mineral (NPK) and biological fertilizer (Herbagreen). At combination of Extrasol and Herbagreen is reported the weakest development of microorganisms, but at the expense of this the mineralization coefficient is highest.