Irawan, Surya, Bambang Hermanto, and Risnawaty Risnawaty. “Pembuatan Pupuk POC NPK Untuk Tananam Padi Di Desa Kolam Percut Sei Tuan”. Jurnal Bakti Nusantara 1, no. 1 (August 30, 2023): 50–55. Accessed November 1, 2025. https://ejournal.pusmed.com/index.php/JBN/article/view/23.