“AN EXPERIMENT TO DETERMINE THE OPTIMAL VALUE OF ORGANIC FERTILIZER AND BIOCHAR TO INCREASE PRODUCTIVITY OF SHALLOTS VAR. BATU IJO” (2024) Surjan: Journal of Sustainable Agriculture, 1(1), pp. 1–9. Available at: https://ejournal.iaar.or.id/surjan/article/view/2 (Accessed: 20 September 2024).