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Direct Research Journals
Direct Research Journal of Agriculture and Food Science:Vol.6 (1), pp. 19-26, January 2018
ISSN 2354-4147

Soil factors influencing the availability of manganese under different land-use systems in coastal plain sands derived soils of Umudike, Nigeria
Article Number: DRJA631608783

Original Research Article

Ernest U. Eteng

Department of Soil Science and Meteorology, Michael Okpara University of Agriculture, Umudike, Nigeria.


date Received: November 20, 2017     date Accepted: December 10, 2017     date Published: December 20, 2017


The research was conducted in March, 2017 at the Michael Okpara University Agriculture, Umudike, Nigeria to investigate soil factors influencing the availability of Mn in soils under different land-use systems. Soil samples were collected from two depths (0-20 and 20-40 cm) from five selected land use types, cassava farm, natural fallow, rice farm, forest and grazing fields. Available Mn in the soils was determined using four extractants; Coca-Cola, EDTA, HCl and NH4OAc. The results showed that, higher mean values of physico-chemical properties were generally recorded in the surface (0-20 cm) compared to the subsurface (20-40 cm) soil layer and were also significantly affected by the land use. The highest and the lowest mean values of available Mn were obtained in flood rice farm and cassava farm, respectively. The availability of Mn varied widely depending on the used extraction which were in the order of Coca-Cola > EDTA > NH4OAc > HCl extractants. Manganese extracted by all extractants was well correlated with organic matter, pH and ECEC, which suggests that these soil properties were responsible for the availability of Mn in the soils under different land use systems.

Key words:  Extractable-Mn, soil physico-chemical properties, soil depth, land uses