This study examined the effects of applying compost made from Trichoderma viride APT01 mud cake (compost APT) on apple production in Bumiaji Batu, Indonesia. Apple production in the region had been decreasing due to soil degradation. The study involved applying 10kg and 20kg of compost APT per tree and comparing fruit number and weight to controls with no compost or Bokashi compost. Results showed applying 10kg and 20kg of compost APT increased fruit number by 58.57-67.14% and fruit weight by 74.51-135.91% compared to controls after 3-4 months. The compost application improved soil fertility and availability of nutrients like