MULYONO, N., MAAS, A., PURWANTO, B. H., & SUDIRA, P. (2018). Short Communication: Volcanic ash utilization as planting medium of curly lettuce with charcoal husk and urban waste compost as soil amendment. Asian Journal of Agriculture, 2(2), 39-43. https://doi.org/10.13057/asianjagric/g020201