AUTHOR=Mannino Giuseppe , Bertea Cinzia M. , Bonini Paolo TITLE=Editorial: Characterization of biostimulants used in agriculture: A step towards sustainable and safe foods JOURNAL=Frontiers in Plant Science VOLUME=13 YEAR=2022 URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2022.1065879 DOI=10.3389/fpls.2022.1065879 ISSN=1664-462X