Elpiani Br Sinulingga, Muhammad Rizwan, Diapari Siregar, Syamsafitri. OPTIMIZING THE USE OF SINABUNG VOLCANIC ASH AND ORGANIC MATTER AS SOIL AMENDMENTS TO SUPPRESS LATE BLIGHT (PHYTOPHTHORA INFESTANS) AND INCREASE POTATO (SOLANUM TUBEROSUM) PRODUCTION IN THE KARO HIGHLANDS. IJEBAS [Internet]. 2026 Aug. 31 [cited 2026 Sep. 1];6(5):2681-704. Available from: https://radjapublika.com/index.php/IJEBAS/article/view/6399