The application of cyanobacterial biofertilizers in the practice of cultivating agricultural crops is effective and necessary because their administration shows positive benefits both on the soil and on the cultivated plants. The species Nostoc gelatinosum (Schousb) Elenk. also belongs to the group of nitrogen-fixing cyanobacteria which lives intensively on various types of soil, is resistant to various environmental conditions, their biomass contains multiple biologically active substances and presents premises for use as biofertilizer. Thus, in order to highlight the premises of using the biomass of the cyanobacteria N. gelatinosum as a biofertilizer, experiments were carried out in the open field for the cultivation of sunflower and corn. The researches were carried out, in our country, in the commune of Măleieşti, dist. Orhei within the enterprise SRL "Vindex Agro". In the research, the fresh biomass of the N. gelatinosum species was used in a dose of 12 kg/ha, and the lots, with the same area for the same crops, where no cyanobacterial biofertilizer was administered, served as a control. The experiments were mounted on an area of 30 m2 each lot, the variants being exposed in three repetitions. The cyanobacterial biomass was administered by sprinkling drinking water on the soil surface during the period when the sunflower seedlings had 13 leaves, and the corn seedlings had 5. During the experiments, the total nitrogen content and soil pH were monitored, the growth process of the seedlings and the harvest obtained. In the variants with administration of cyanobacterial biomass, the soil pH changed in the slightly alkaline direction (in the variants with biomass administration it was between 7,42-7,62, and in the control ones 6,85-7,53) and the content total nitrogen in the soil, at the end of the experiments, increased by approx. 0,01-0,02%. In the variants with administration of cyanobacterial biomass, the quantitative oscillation of soil nitrogen characterized by an increase in content followed by its reduction, after which this process was repeated, was attested. Administration of N. gelatinosum biomass had a positive impact on the process of plant height growth during the entire monitored period. Thus, in the lots with biofertilizer administration, the sunflower plants were taller by approx. 2-5 cm, and the corn ones by 1-4 cm compared to those in the control variants. The application of the cyanobacterial biofertilizer also stimulated the productivity of the crops, in the variants with the administration of the biofertilizer, the sunflower yield increased by 30-35 kg/ha, and the corn cobs by 100-400 kg/ha. Thus, we find that the application of N. gelatinosum cyanobacterium biomass as a biofertilizer to the cultivation of sunflower and corn contributes to improving the condition of the soil, increasing the yields obtained and creates practical premises for the use of cyanobacterial biomass as a biofertilizer.