AUTHOR=Brown Patrick , Saa Sebastian TITLE=Biostimulants in agriculture JOURNAL=Frontiers in Plant Science VOLUME=6 YEAR=2015 URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2015.00671 DOI=10.3389/fpls.2015.00671 ISSN=1664-462X