Putra , G.J.K. et al. 2022. The Effect of Nitrifying Bacteria Addition during Cow Urine Fermentation on the Quality of Liquid Organic Fertilize. Jurnal BETA (Biosistem dan Teknik Pertanian). 10, 1 (Apr. 2022), 11–20. DOI:https://doi.org/10.24843/JBETA.2022.v10.i01.p025.