ABSTRACT Chlorella sp. has a pigment, namely chlorophyll-a which plays a role in the process of photosynthesis. Chlorella sp. culture requires nutrients and chlorophyll-a pigment to increase cell growth. Liquid organic fertilizer (LOF) Azolla sp. is expected to be able to meet the nutrients needed by Chlorella sp. This study aims to determine whether there is an effect of the use (LOF) of Azoll…