Acid sulfate soils have low fertility, with biophysical land conditions such as high acidity, high levels of potentially toxic elements, and deficiencies in essential nutrients, especially phosphorus, making these soils have limited capacity to support plant growth. One effort that can be made to improve the properties of acid sulfate soils is through land amelioration. The aim of this study was to determine the effect of applying liquid organic fertilizer from banana stems and chicken manure on changes in the chemical properties of soil in acid sulfate lands. This study was conducted in a factorial Completely Randomized Design (CRD) with a single factor consisting of nine treatments with three replications. The results showed that the application of liquid organic fertilizer from banana stems and chicken manure influenced soil pH, the availability of N, P, and K nutrients, and was able to reduce the value of exchangeable (Al-dd) and soluble (Fe)