Total And Extractable Iron And Manganese In Soils Developed On Charnockite In Ekiti State, Nigeria
Keywords:
Charnockite, profile distribution, total iron, total manganese, extraction methodsAbstract
The profile distribution of Iron (Fe) and Manganese (Mn) was surveyed in six locations of Ekiti State where charnockite parent rocks occur. The perchloric-hydrochloric acid digestion method was used for the determination of total Fe and Mn. Extractable Fe and Mn were determined using two extractants: 0.1M HCl at 1:10 soil: solution ratio. The study revealed that Ap horizon contained the highest total Fe and lower values in the immediate Bt1 horizon followed by increases with depth while extractable Fe decreased down the profile. Total Mn range was 34-340mg.kg- 1 with mean of 101.17mg.kg-1 while mean 0.1MHCl- and DTPA extractable Mn was 22.53 and 7.37mg.kg-1 with ranges of 3.14- 95.08 and 0.33-23.70mg.kg-1 respectively. Total Mn and extractable Mn decreased down the profile in all locations. The high extractable Fe and Mn in the top-soils is an indication that prospects of deficiency are little under the predominant low intensity farming practices. The significant correlations of extractable Fe and Mn with pH suggest that this soil property is relevant to availability of the nutrients while the correlations with organic matter mean that soil management practices which raise and maintain soil organic matter should be emphasized.
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