Comparative tests of ridging cultivators with active and passive working tools Andrey Panov, Maxim Mosyakov, Stepan Semichev, Valery Plyaka, Nikolay Lylin and Mikhail Mekhedov E3S Web Conf., 264 (2021) 04017 Published online: 02 June 2021 DOI: 10.1051/e3sconf/202126404017