A contrast among farmers’ ethnic groups: is this a social polarization tendency? Siti Aida Adha Taridal, Nur Isiyana Wianti, Muhammad Arsyad and Arifiana Shima Ekaputri E3S Web Conf., 52 (2018) 00044 Published online: 27 August 2018 DOI: 10.1051/e3sconf/20185200044