Inducing potato tuber formation at low elevation of tropical region by foliar spray of PGR mixtures at different application timesU.K.J. Suharjo, T. Pamekas, P. Harsono and A.M. SilalahiE3S Web of Conf., 373 (2023) 03027DOI: https://doi.org/10.1051/e3sconf/202337303027