Arginine is used as nitrogen storage and transport molecule in many plants. Arginine induces the synthesis of fruit and flower hormones. It is a precursor of the synthesis of polyamines (putrescine, spermidine and spermine), proline, alkaloids, ornithine, citrulline and nitric oxide. It is also important for overcoming stress conditions. Studies conducted on the application of arginine in the rhizosphere showed an increase in the number of roots. Arginine promotes the positive effect of the auxin IBA on the roots, increasing both the number of roots and their length.