It is known that, Biofertilizers (or bacterial fertilizers) are preparations of microorganisms, that help to increase soil fertility by increasing the concentration or bioavailability of macronutrients. Biofertilizers are preparations of symbiotic nitrogen-fixers - nodule bacteria (Rhizobium sp, Bradyrhizobium sp.), as well as the associative nitrogen-fixers, for example, Azospirillum, Azotobacter, Agrobacterium, Azomonas; the phosphate mobilizing bacteria (Bacillus megaterium, Pseudomonas aureofaciens) increase the bioavailability of the mineral and organic compounds of phosphorus (phytate and phosphate) of metals and related them - Mg, Ca, Fe, Zn etc.
Fertilizing effect of the effluent (digestate) is mainly due to the presence of nitrogen in organic and mineral form, as well as phosphorus and potassium compounds.
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