The effectiveness of aglime ameliorant to improve soil pH and maize (Zea mays L.) growth and production in Langkat RegencyErpina Delina Manurung, Khadijah EL Ramija and Siti Fatimah BatubaraE3S Web Conf., 306 (2021) 04005DOI: https://doi.org/10.1051/e3sconf/202130604005