BACHTIAR, A. G.; HARTAWAN, L. Pengukuran NPK (Nitrogen, Phosphor, Kalium) Tanah Berbasis IoT (Internet of Things). e-Proceeding FTI, [S. l.], 2024. Disponível em: https://eproceeding.itenas.ac.id/index.php/fti/article/view/3394. Acesso em: 1 feb. 2026.