Razali, and Dolly Sojuangan Siregar. 2025. “Optimum Doses of N, P, And K Fertilizers For Samosir Shallot Varieties in the Plains of the Lake Toba Region”. Jurnal Online Pertanian Tropik 12 (1):9-15. https://doi.org/10.32734/jpt.v12i1.16245.