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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/7313

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.
Quansah, C.
Agyare, A. W.
Bonsu, M.
Odai, S. N.
Keywords: Deposited sediment
nutrient depletion
small reservoirs
fertility erosion
Issue Date: 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 ofGhana to assess the on-site effects and the cost of fertility erosion from five small reservoircatchments (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 corre-sponding 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 Ze-billa, 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 catch-ment soils. This will adversely affect crop productivity if no control measures are implemented. This can also lead to land degradation.
Description: Article published in Journal of Science and Technology, 2013. Also available at http://dx.doi.org/10.4314/just.v32i2.10
URI: http://hdl.handle.net/123456789/7313
Appears in Collections:College of Engineering

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