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 2023, 21 (3), 208-211. https://doi.org/10.29244/jintp.21.3.208-211.