LAUSR

This research was conducted in soil chemical laboratory, Faculty of Agriculture, Andalas University, from December 2016 until May 2017. The purpose of this research are to determine the level of activeness of powder coal S ub - bitumin o us coal with Sodium Hydroxide (NaOH) and to determine the appropriate dosage of the mixture in improving the chemical properties of Ultisol s . This research was conducted in 2 stages: first stage study with 10 treatments (1% to 10% (w/w) NaOH) and the second stage study on soil using 15 treatment combinations (3 doses of powder sub-bituminous coal with 5 doses of NaOH). The results of the first stage of research is the addition of NaOH in Sub-bituminous to increase the activity of powder Sub-bituminous coal with parameters of pH , CEC , and i ncreases the number of O - H, C=O, and CH 3 groups .The results of stage II studies is the provision of a mixture of 20 ton ( ha ) -1 powder Sub-bituminous coal and 10% of NaOH  were able to increases the pH of H 2 O, CEC, organic-C, Available-P, and Total-N Ultisol each of 1.49 units, 28.08 me.100g-1, 1.63 % C, 2.37 ppm P, 0.06% N, and decreases Al-exch Ultisol by 1.17 me.100g-1and , SAR Ultisol by 0.03, and ESP Ultisols by 0.82 % compared to nature soil.