Effect of MgSO4 as a complement to NPK fertilizer on shallot growth Jauhari Syamsiyah, Ganjar Herdiansyah, Komariah, Bardhian Cahyo Aji Gumilang, Lidya Zaela Wijaya and Hendricus William Siswantoro BIO Web Conf., 155 (2025) 01008 Published online: 29 January 2025 DOI: 10.1051/bioconf/202515501008