Wijayanti, A.R. and Cahyaningrum, S.E. 2024. Effect of Urea Variation Concentration on Slow Release Fertilizer (SRF) Based Chitosan/NaTPP/Calcium . Jurnal Pijar Mipa. 19, 5 (Sep. 2024), 893–897. DOI:https://doi.org/10.29303/jpm.v19i5.7401.