FS, Harahap, and Benny Hidayat. “The Effect of Rice Husk Ash and Goat Manure on the Growth of Spinach (Amaranthus Gangetius) ”. Jurnal Online Pertanian Tropik 8, no. 1 (June 24, 2021): 26–32. Accessed December 27, 2025. https://talenta.usu.ac.id/jpt/article/view/5392.