The carrying out of uniform forage crops represents an important technological loop for all agricultural species. The uniformity of these crops is caused especially by seed germination capacity, respectively by plant emergence capacity, depending upon the climatic and technological conditions. With regards to the researches carried out in this direction, we present here the influence exerted by some biostimulators, used through extra-root application during plant vegetation period, upon seeds submitted to germination. Concerning the red clover seeds, we may notice an increase of the germination energy from 88.33% in the untreated control variant to 95.67% in the variants submitted to treatments with biostimulant substances.