AUTHOR=Chauhan Bhagirath Singh TITLE=Grand Challenges in Weed Management JOURNAL=Frontiers in Agronomy VOLUME=1 YEAR=2020 URL=https://www.frontiersin.org/journals/agronomy/articles/10.3389/fagro.2019.00003 DOI=10.3389/fagro.2019.00003 ISSN=2673-3218