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|Title: ||On-Site Effects and Cost of Fertility Erosion from Five Small Reservoir Catchments in the Upper East Region of Ghana|
|Authors: ||Amegashie, B. K.|
Agyare, A. W.
Odai, S. N.
|Keywords: ||Deposited sediment|
|Issue Date: ||Aug-2012|
|Publisher: ||Journal of Science and Technology|
|Citation: ||Journal of Science and Technology, Vol. 32, No. 2, 2012, pp 78-93|
|Abstract: ||A study was carried out in the Upper East Region of Ghana to assess the on-site effects and the
cost of fertility erosion from five small reservoir catchments (Dua, Doba, Zebilla, Kumpalgogo
and Bugri). The catchment soils and reservoir sediments were sampled and analyzed for their
bulk density and nutrient content. The mean reduction in soil depth in the various catchments
was 3.996±3.806 mm y-1 in the order of Kumpalgogo>Dua>Bugri>Zebilla>Doba. The corresponding
decrease in the water holding capacity of the top 20 cm depth of the catchment soils
ranged from 0.563 to 4.698 % per year. The percentage loss in the total nutrient stocks in the top
20 cm of the catchments as eroded sediment-bound nutrients ranged from 9.63 to 64.71, 7.87 to
56.83, 6.12 to 54.82, 1.26 to 40.14, 49.86 to 12.65, 16.84 to 72.07 for OC, N, P, K, Ca and Mg,
respectively. The total amount of nutrient loss in kg ha-1 among the reservoirs ranged from 2383
to 19672 for OC, 153 to 3048 for N, 3.15 to 42.59 for P, 41 to 290 for K, 432 to 2158 for Ca, and
63 to 483 for Mg. The cost of N, P and K removed by erosion was calculated by the Replacement
Cost Method. The total cost per year (GH¢ ha-1 y-1) of fertilizers (sulphate of ammonia, single
superphosphate and muriate of potash) was 286.15 for Dua, 74.289 for Doba, 225.061 for Zebilla,
1119.997 for Kumpalgogo and 96.376 for Bugri. The study has amply shown that soil loss
through erosion reduces top soil depth, nutrient stocks and the water holding capacity of catchment
soils. This will adversely affect crop productivity if no control measures are implemented.
This can also lead to land degradation.|
|Description: ||Article published in the Journal of Science and Technology, Vol. 32, No. 2, 2012, pp 78-93|
|Appears in Collections:||Journal of Science and Technology 2000-|
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