PHOSPHATE SOLUBILIZING FUNGI ARE ONE OF THE MEMBERS OF SOIL MICROBES THAT CAN INCREASE THE AVAILABILITY AND UPTAKE OF P BY PLANTS. PHOSPHATE SOLUBILIZING FUNGI HAVE 3 MECHANISMS IN INCREASING P ABSORPTION, NAMELY: (1) PHYSICALLY WHERE FUNGAL INFECTIONS ON PLANT ROOTS CAN HELP PHOSPHORUS UPTAKE BY EXPANDING THE SURFACE TO THE ROOTS; (2) CHEMICALLY, FUNGI ARE THOUGHT TO ENCOURAGE CHANGES IN ROOT PH. FUNGI ALSO PRODUCE CITRIC ACID AND OXALIC ACID WHICH REPLACE THE POSITION OF FIXED PHOSPHATE IONS; (3) PHYSIOLOGICALLY, FUNGI PRODUCE AUXIN, CYTOKININ AND GIBBERELLIN HORMONES WHICH CAN SLOW DOWN THE ROOT AGING PROCESS, THEREBY EXTENDING THE ABSORPTION PERIOD OF NUTRIENTS. THE MECHANISM OF DISSOLVING PHOSPHATE THROUGH MINERALIZATION OF ORGANIC P DERIVED FROM PLANT, ANIMAL AND BACTERIAL RESIDUES THROUGH ORGANIC ACID SECRETION. THEREFORE, THIS STUDY AIMS TO EXPLORE PHOSPHATE SOLUBILIZING FUNGI ON PEATLANDS UNDER OIL PALM STANDS AGED 2 YEARS (S2), 6 YEARS (S6), 10 YEARS S (10) AND EXAMINE THE PHOSPHATE SOLUBILIZATION ABILITY OF THE PHOSPHATE SOLUBILIZING FUNGI OBTAINED. THIS STUDY IS A DESCRIPTIVE QUALITATIVE EXPLORATORY STUDY, WITH AN EFFORT TO FIND FACTS WITH PROPER INTERPRETATION. THIS RESEARCH WAS CONDUCTED ON JALAN KAMPUNG BARU, KELURAHAN LANDASAN ULIN UTARA, LIANG ANGGANG DISTRICT. BASED ON THE RESULTS OF THE RESEARCH CONDUCTED, IT CAN BE CONCLUDED THAT THERE ARE DIFFERENCES IN THE POPULATION OF PHOSPHATE-SOLUBILIZING FUNGI ON PEATLANDS UNDER OIL PALM STANDS WITH DIFFERENT PLANT AGES. PHOSPHATE SOLUBILIZING FUNGAL ISOLATES ON 2-YEAR-OLD OIL PALM PLANTS HAVE THE LARGEST PHOSPHATE SOLUBILIZATION INDEX.