Increasing the Potential of the Quality of Ex-Mining Land for Oil Palm Plants with Composting and Humic Acid Methods as Soil Remedies

Coal mining has the potential to cause land damage because it can have an impact on the destruction of the ecosystem so that it can no longer carry out its functions optimally. For this reason, technology is needed to improve the condition of post-mining land, one of which is by adding soil improvers. In this study, the potential quality of damaged ex-mining land was improved by adding compost and humic acid as soil improvement with the hope that the soil would become good again so that it could increase land productivity for oil palm growth. The objectives of this study are: 1) to evaluate the suitability of ex-mining land for oil palm plants, 2) to know the inhibiting or limiting factors of land and how to overcome them, and 3) to find out the best soil amendment treatment for the vegetative growth of oil palm plants. The results of the study showed that: 1) the land of the former coal mine based on the results of the land evaluation was suitable or suitable for planting oil palm plants, 2) the factor that became an obstacle or limiting the potential of the land was soil fertility and how to overcome it by applying or adding compost and humic acid as soil amendments, and 3) the treatment of soil amendments both P0, P1 and P2 showed no significant difference in the results for the vegetative growth of oil palm plants both the increase height, number of leaves and stem diameter at the observation of months 1, 2, 3, 4 and during the 4 months of observation.