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Husk charcoal is a crop waste that can be used to improve tailings media. Tailings have several characters including, low organic matter content, low microorganism activity, low essential nutrient content, low cation exchange capacity and high heavy metals. The design used in this experiment was a complete randomized design factorial with 2 factors. The first factor was the husk charcoal and the second factor was the application of compost fertilizer. The treatment of husk charcoal and compost did not significantly affect the growth of total dry weight and root Chapter contents Introduction  228Materials and methods  229 Time and place of research  228 Experimental design and data analysis  229 Research tools and materials  229 Research procedures  229 Media preparation  229 Seed weaning and maintenance  230 Data collection and analysis  230 Results and discussion  230 Growth of A. mangium seedling in the tailing  230 Efects on soil nutrient properties  231 Conclusion  234 References  234

Application of husk charcoal for waste risk minimization by growing Acacia mangium (Willd.) on gold mining media