Sokoine University of Agriculture

Characterization of volcanic ash soils in south-western Tanzania: morphology, physicochemical properties, and classification

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dc.contributor.author Msanya, B. M
dc.contributor.author Otsuka, Hiroo
dc.contributor.author Araki, Shigeru
dc.contributor.author Fujitake, Nobuhide
dc.date.accessioned 2016-10-04T10:01:43Z
dc.date.available 2016-10-04T10:01:43Z
dc.date.issued 2007-03
dc.identifier.citation Suppl.34: 39-55, March 2007 en_US
dc.identifier.uri http://hdl.handle.net/123456789/836
dc.description.abstract ABSTRACT This study examined the characteristics of volcanic ash soils in southwestern Tanzania. Twelve pedons of volcanic origin were studied, and 66 soil samples were analyzed. Soil morphology revealed volcanic ash layers of varying thicknesses. Most pedons had a dark thick humus surface and buried A, AB, and BA horizons with melanic indices of 1.7 or less. Except in two pedons, the NaF pH was 9.4 or more, reflecting an exchange complex domi- nated by amorphous materials and/or Al–humus complexes. The phospate-retention capacity ranged from 65 to 100%, except in two pedons, and was positively correlated with NaF pH. Both Tanzanian and Japanese volcanic ash soils showed comparable ranges of base saturation (BS) values, but the distribution patterns of BS basic cations, for example, showed some dif- ferences. Some Tanzanian volcanic ash soils had higher BS values than their Japanese coun- terparts. While the Japanese soils were generally more calcic and magnesic, the Tanzanian soils were more potassic and sodic than their counterparts, most likely reflecting lithologi- cal differences among parent materials in the two study areas. According to the USDA Soil Taxonomy, nine pedons satisfied the requirements for andic properties and were classified as Andisols at the order level, whereas according to FAO World Reference Base (WRB) soil classification, eight pedons were classified as Andosols at the level of reference soil groups. en_US
dc.language.iso en en_US
dc.publisher African Study Monographs en_US
dc.subject Soil classification en_US
dc.subject Morphology en_US
dc.subject Physicochemical characteristics en_US
dc.subject Volcanic ash soils en_US
dc.subject Tanzania en_US
dc.title Characterization of volcanic ash soils in south-western Tanzania: morphology, physicochemical properties, and classification en_US
dc.type Article en_US


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