Mount Sinabung was active again in 2010 after 400 years of dormancy and it is still erupting to date. The eruptions produced volcanic ash which blanket the soil surface. The distribution of volcanic materials was monitored by using Landsat Satellite which covers an area of 30, 320 Ha in 2018, then in 2019, it changed to 1, 371 Ha. After eruptions for 10 years, we believed soil characteristics are changed. The objective of this study was to characterize soil properties in the vicinity of Mt. Sinabung. There were 34 soil samples taken at a depth of 0-20 cm with a total research area of 4, 517.25 Ha. The samples were analyze for chemical properties included pH (H2O), total N, organic carbon, exchangeable base cations, and cation exchange capacity (CEC). The results showed that the pH (H2O) ranged from very acidic to neutral (4.14-6.52). The total N low to high category (0.13-0.60%). Organic carbon low to very high (1.73-13.05%). The exchangeable base cations have a high concentration with values of K (1.60-2.98 cmol kg−1), Na (3.72-7.45 cmol kg−1) and Mg (5, 79-12.15 cmol kg−1) respectively. Cation exchange capacity (CEC) showed high to very high category values (11.78-97.71 cmol kg−1). Volcanic ash provides many benefits to soil properties. This indicates that volcanic ash enrich soils by providing nutrients to the soils aftermath of volcanic eruptions.

This study consisted of two stages of the experiment, in which the first phase was aimed to test the level of activity unproductive coal powder (sub-bituminous) activated with urea (CO(NH2)2). Experiment II was aimed to select the dose of Urea was right in fixing chemical properties sub-bituminous powder to be applied to mineral soil acidic (Ultisols). Experiment I form into activation powder sub-bituminous (50 g) with urea at a dose of 1,

This study was aimed to examine the classification of soil in Sungai Kamuyang, West Sumatra by the USDA Soil Taxonomy up to the level of familty. This research was conducted in Sungai Kamuyang, Luak District, Limapuluh Kota Regency, West Sumatra, Laboratory of Soil Science Andalas University, and Laboratory of Soil Chemistry and Soil Mineralogy of Soil Research Center, Bogor. This research used a survey method with several stages: Preparation, Pre-Survey, Main Survey, Soil Analysis, and Data Processing. Based on the resluts in classification of Soil in Sungai Kamuyang, it found differences in the resluts in classification of Soil in Sungai Kamuyang served Land Unit Map Solok Sheet by Soil and Agroclimate Research Center in 1990, which is only on the profile SL3 showing characteristics of Andisols while on the other profiles show Inceptisols characteristics.