Akpan And Nkanga

Akpan and Nkanga

Greener Journal of Agricultural Sciences Vol. 7 (3), pp. 065-073, May 2017.

 ISSN: 2276-7770 

Research Article

Manuscript Number: 040517047


DOI:
http://doi.org/10.15580/GJAS.2017.3.040517047


Phosphate
Sorption Capacity, Bonding Energy and Buffering Mechanisms of Wetland Soils in
Akwa Ibom State, Nigeria

 

*Akpan
US and Nkanga NA

 

Department of Soil Science and
Land Resources Management University of Uyo, AkwaIbom State, Nigeria


Abstract

Phosphate sorption capacity, bonding
energy and buffering capacity of wetland soils in Akwa Ibom State, Nigeria were
assessed for effective  and sustainable
soil management. Three wetland types (inland depression, river floodplain and
coastal swamp) were selected for the study. In each wetland type, three
locations were selected (9 locations) and in each location, soil samples were
collected from 3 points at the depth of 0 -30cm and bulked to form composite
samples using soil auger and taken to the laboratory for analysis.  In the laboratory, a solution containing
0,  20, 40 and 80 ml prepared from 6.15g
of KH2 PO4 (Potassium hydrogen phosphate) in 1500ml of
distilled water and make up to two (2) litres with distilled water was used for
the study. 2.5g of soil samples were weighed into a 50ml plastic cup and 2.5ml
of each of the 4 sorption treatments solution were added to each of the soil in
the cups and mixed thoroughly for effective mixing of P solution with the soil.
The set ups were covered and incubated for 7 days. The treated soil samples
were watered with deionized water once to keep the sample moist throughout the
period of incubation. On the 7th day, P in each of the treated soil samples and
the leachate were extracted using Bray-P-1 extractant.   The P in the extract was determined using
Murphy and Riley method. The P extracted from the soil samples were considered
to be P adsorbed while P in the leachate samples were considered to be P in
solution. Langmuir equation was used to estimate P adsorption capacity, bonding
energy and P buffering capacity of the soils. The results showed that floodplain soils had the highest mean phosphate adsorption
capacity (0.50 mgkg-1), followed by soils of inland depression (0.32
mgkg-1) while coastal swamp soils had the least (0.09 mgkg-1).
The trend was as follow: floodplain soils > soils of inland depression >
coastal swamp soils. Coastal swamp soils had the highest bonding energy (0.54
Lmg-1), followed by floodplain soils (0.27 Lmg-1) while
soils of inland depression had the least (0.07 Lmg-1). The trend was
as follow: coastal swamp soils > floodplain soils > soils of inland
depression. Floodplain soils had the highest maximum buffering capacity
(0.047), followed by coastal swamp soil (0.042) while soils of inland
depression had the least (0.018). The trend was as follow: Floodplain soils
> coastal swamp soils > soils of inland depression. Hence, the three
wetland soil types were not the same in P
sorption capacity, bonding
energy and buffering capacity.

 

Keywords: sorption capacity, bonding
energy and buffering capacity, wetland soils of Akwa Ibom State.

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