Digital mapping of cultivated land in two Peri-urban areas of Ibadan, Nigeria
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Date
2020-05-04
Journal Title
Journal ISSN
Volume Title
Publisher
Nigerian Journal of Soil Science
Abstract
The need to save time, money and enhance quality as well as precise soil survey
information through improved methodologies calls for digital soil mapping:
hence, this study was conducted to map the peri-urban soils of Ajibode and Lade
in Ibadan metropolis with digital method. Detailed soil survey using grid method
was employed to cover the entire representative area for the study. Observation
points were taken at a 100-meter interval. Six profile pits were dug, each at the
three predominant land types viz: upper, middle and valley bottom in both locations. Profile pits were described and sampled for physical and chemical analyses
following standard methods. Soil samples were collected at 0 -15cm and 15 -
30cm and further subjected to geospatial techniques for maize and cassava soil
suitability production. Soils in Ajibode were classified as Iwaji Balogun and Oba
series and fitted into Quartz-udic psamment according to USDA (2010) soil taxonomy system but correlated as Fluvisols following (FAO/UNESCO 2006). At
Lade, soils were classified as Iwo, Balogun and Matako series. Iwo and Balogun
series fitted into Rhodic-ustalf according to USDA (2010) and fitted as Lixisol in
FAO/UNESCO (2006), while Matako series fitted into Dystric-fluvaquent
(USDA, 2010) but qualified as Fluvisol FAO/UNESCO, (2006). Soils in Ajibode
varied between moderately to marginally suitable for maize and cassava. In contrast, at Lade, it varied between moderately to marginally suitable for cassava and
non-suitable for maize production. Mapping of soil using geospatial method
helps to increase the efficiency of soil mapping, and thus recommended for precision and sustainable agriculture