The research was carried out on degraded peat land in Kalampangan village, Sebangau District, Palangkaraya, from June to October 2017. The treatments given were factor I; Types of ameliorant material (A1; 100% cow manure, A2; 50% cow manure+ 50% biochar, A3; 50% cow manure+ 50% compost from weed in situ, A4; 50% cow manure+ 50% ash from weeds in situ), and factor II; Dosage of NPK fertilization (D0; without NPK, D1; 50% of recommended dose; D2; 100% of recommended dose, D3; 150% recommended dose). The treatment was arranged in a factorial randomized block design (RBD), and repeated 3 times. Observation variables include the soil pH and P-available, The number of fruit per plant, the weight of chili and chili yields. The results showed that the highest soil pH was indicated by A4D1 treatment. However, the highest soil P indicated by the A4D3 treatment, as well as for the highest chilli yield indicated by A4D3 treatment reached 19 t/ha or increased 6% from the recommended dose (18 t/ha) on the same ameliorant treatment (A4), and increased up to 43% compared to the ameliorant A1 (100% cow manure) on the same dose of NPK fertilizer.