Adequacy of micromineral content (Fe, Zn, Cu) of Napier grass (Pennisetum purpureum) as beef cattle feed in Merapi volcanic slopes of Magelang Regency, Indonesia: Kecukupan kandungan mikromineral (Fe, Zn, Cu) rumput gajah (Pennisetum purpureum) sebagai pakan ternak sapi pedaging di pegunungan Merapi di Kabupaten Magelang, Indonesia. JINTP [Internet]. 2023 Dec. 31 [cited 2025 Dec. 24];21(3):208-11. Available from: https://journal.ipb.ac.id/jurnalintp/article/view/50869