Oswaldus, O., Widowati, W., & Karamina, H. (2022). Impact of Biochar Use After Five Years in Vertisol and NPK Fertilization on Yield of Shallot (Allium ascalonicum L.). JURNAL BUDIDAYA PERTANIAN, 18(1), 35-41. https://doi.org/10.30598/10.30598/jbdp.2022.18.1.35