Mahdalena and Hamidah 2026. Synergistic Effect of Shrimp Shell Liquid Organic Fertilizer and Phonska NPK on the Growth of Robusta Coffee (Coffea canephora) Seedlings: Sinergi POC Kulit Udang dan NPK Phonska dalam Meningkatkan Pertumbuhan Bibit Kopi Robusta (Coffea canephora). Agrifarm: Jurnal Ilmu Pertanian. 15, 1 (Jul. 2026), 105–116. DOI:https://doi.org/10.24903/ajip.v15i1.4031.