STUDI PERKEMBANGAN TANAH ABU VULKANIK TOPOSEQUENT GUNUNG MERAPI DAN GUNUNG SINGGALANG

Abstract

ABSTRACT
Volcanic Ash Soil development were studied on toposequent of Gunung Merapi and Gunung Singgalang. Morphological, Chemical and Mineralogical properties of 8 profiles Vulcanic Ash Soil were investigated with different altitude (1100 and 1200 meters ) on each of Gunung Merapi and Gunung Singgalang. Field observation on soil profiles and laboratory data shown that there are different of the soil Colors between Gunung Merapi toposequent and Gunung Singgalang, wich of Gunung Singgalang toposequent more that lights its soil colors. Genetic horizon are more completely on Gunung Singgalang profiles, mean while horizon. thickness, more thick on Gunung Merapi profiles. Short range order mineral transformation on Gunung Singgalang profiles are the degree of haloysite. Heavy mineral content more least on Gunung Singgalang toposequent than Gunung Merapi, mean while weathering index on Gunung Merapi toposequent are bigger. Morphological, chemical and mineralogical characteristic shown that Vulcanic Ash soil of Gunung Singgalang toposequent are more advanced develop than Gunung Merapi toposequent