Application of Humic Subtances and Bottom Ash Compounds in Improving Soil Quality in Lime Stone Post-Mining Land
Musfira M, M Jayadi, A Ahmad

universitas hasanuddin

Abstract

The mining sector in Maros Regency in the past five years shows a significant growth rate, one of which is PT. Bosowa which has a limestone mine site with an area of 749.14 Ha mining license. Limestone mining leaves the ex-mine land with poor soil chemical quality, which requires efforts to improve soil quality. One way that can be used is by applying humic subtances and coal ash (Bottom ash). Humic subtances can be used as fertilizer to increase the availability of macro nutrients in the soil and improve pH and the application of coal ash can improve the chemical, physical and biological properties of the soil because it has a pH value, high organic C content, available P, and basic cations such as K, Na, Ca, and Mg. This research aims to determine the effect and interaction of the application of humic subtances and bottom ash interaction with different doses to improve the quality of soil after limestone quarry. This research uses a randomized block design in a factorial pattern. This experiment consisted of humic subtances factor (H) with 4 levels namely H0, H1 (0.09%), H2 (0.12%), and H3 (0.15%) and bottom ash factor (B) with three levels : B0, B1 (400 grams), B2 (600 grams) totally 12 treatment combinations then the number of experimental units is 36 experimental units. Humic subtances at H2 concentration (0.15%) significantly increased C-organic, K, P-available, Mg-dd and increased plant height, whereas the treatment of bottom ash at a dose of B2 (600 grams) significantly affected the increase in C-organic , P-available, and Mg-dd. The treatment of humic subtances with concentrations of H3 (0.15%) and bottom ash at a dose of 600 grams is the best interaction characterized by an increase in soil pH, CEC, Ca-dd, K, and Na. Based on the results of the study it can be concluded that the aplication of humic subtances with a concentration of H3 (0.15%) or 1500 ppm and the provision of bottom ash with a dose of B2 (600 grams) or 120 tons / ha have a significant effec

Keywords: post-mining soil, soil chemical properties, humic subtances, bottom ash

Topic: Biodiversity and Climate Change