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Agro-Science
Journal of Tropical Agriculture, Food, Environment and Extension
 

ISSN 1119-7455
   
 
         
 
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Article No 11 of Volume 7.2 (2008)
 
    
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ASSESSMENT OF MICRONUTRIENT STATUS OF INLAND DEPRESSION AND FLOODPLAIN (WETLAND) SOILS IN AKWA IBOM STATE SOUTH-EASTERN NIGERIA

Udoh  Bassey T.1 Ibia  Trenchard O.1. Udo  Bassey U. 2

and . Edem Stephen O.1

1Department of Soil Science,

University of Uyo,  Akwa Ibom State, Nigeria.

2Department of Agricultural Technology,

Akwa Ibom State College of Agriculture, Obio Akpa, Nigeria.

                                 

 

 

ABSTRACT

The available micronutrients status of soils of two wetland types: inland depression (ID) and Floodplain (FP) were studied. Six representative soil profiles, three for each wetland type were dug, 13 and 14 soil samples, respectively were collected from each wetland type according to their genetic horizons, for laboratory analysis and interpretation. The result showed that Iron (Fe) content had a mean value of 142.62mg/kg for ID soils and 213.16mg/kg in FP soils. The mean values of manganese (Mn) were 7.43mg/kg for ID soils and 3.19 mg/kg for FP soils. Also, zinc (Zn) content had mean values of 8.50mg/kg for ID soils and 2.67mg/kg for FP soils, while copper (Cu) content had mean values, 4.30 and 2.20mg/kg for ID and FP soils, respectively.  All the above values were higher than the critical values of 4.2, 0.2, 0.5 and 1.0mg/kg for Fe, Cu, Zn and Mn respectively. These excessively high values were also reflected in Fe: Mn ratio of 19.1 for ID soils and 67.5 for FP soils. Also t-test analysis showed that the content of Fe was significantly higher (P £ 0.05) in FP than in ID soils, while Mn, Zn and Cu were higher in ID soils. The results of correlation analysis revealed that in ID soils, Fe, Mn, Zn and Cu had significant (P £ 0.05) positive correlation with sand content (r = 0.55*, 0.58*, 0.58* and 0.64*, respectively) but negative and non-significant with clay fraction. In FP soils all the micronutrients correlated negatively with sand content but only Fe was significant with sand (r = 0.60*). Clay, on the other hand, correlated positively with Fe, Mn and Cu; and negatively with Zn, but only Fe was significant with clay (r = 0.65*).

 

Keywords:  Micronutrients, inland depression, floodplain, wetland and

                     southeastern Nigeria

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Date:22/05/2018
 
     
 
 
 
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