“THE EFFECT RICE HUSK ASH ON AVAIBILITY AND P UPTAKE OF CORN (Zea Mays L.) ON ULTISOL”. 2024. BIOTIK: Jurnal Ilmiah Biologi Teknologi Dan Kependidikan 12 (1): 23-32. https://doi.org/10.22373/biotik.v12i1.20091.