Development and application of new types of fertilizers using innovative nanotechnology are one of the potentiallyeffective options of significantly enhancing the global agricultural productions [1]. Metal nanoparticles are wildly used of their effect on plant germination and growth. The distinctive feature of metal oxide nanoparticles is their lower toxicity in comparison tometal salts and the ability to enhance the physiological and biochemical processes in plants [2]. Encapsulated magnetite nanoparticles (Fe3O4)wereprepared according to the methodof chemical co-precipitation in the presence of poly-N-vinylpyrrolidone (PVP) (MW: 8000).The presence of PVP gives possibility of formation encapsulated nanoparticles. Effect of enscapsulated magnetite nanoparticles (Fe3O4) on wheat (TriticumL.), pumpkin (Cucumis melo L.) and tomato (Solanum lycopersicumL.)seeds was studied. Seeds were germinated in Petri dishes on filter paper substrate within seven days, according to GOST 12038-84.The concentration of solution of magnetite nanoparticles was 10-100 mg/L. Maximal effect was achieved using nanoparticles with concentration of 50 mg/L. Plant length and hypocotyl length increased by 43% and 179%respectively in comparison with control sample. Marginal effect was observed at a concentration below 100 mg/L.