Soil fertility erosion and the associated cost of NPK removed under different soil and residue management in Ghana

Quansah, Charles; Safo, E.Y.; Ampontuah, E. O.; Amankwah, AS

doi:10.4314/gjas.v33i1.1882

Cited by 20 publications

(22 citation statements)

References 6 publications

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“…This is consistent with several studies on fertility erosion in Ghana and other parts of the world. (Quansah et al. 2000; Haregeweyn et al.…”

Section: Resultsmentioning

confidence: 99%

“…Other than the studies of Akrasi and Ansa‐Asare (2008) on nutrient transport to the Pra River basin, little research attention has been directed to sediment‐bound nutrient export from catchments into small reservoirs in Ghana, especially in the Sudan savanna zone. Both published and unpublished data for Ghana to date reveal that most erosion studies have been directed at measuring soil loss and run‐off rates in run‐off plots (Bonsu & Obeng 1979; Quansah et al. 2000; Adama 2003).…”

Section: Introductionmentioning

confidence: 99%

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Sediment‐bound nutrient export from five small reservoir catchments and its implications for the Sudan savanna zone of Ghana

et al. 2011

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A study was carried out in the Sudan savanna zone in the Upper East Region of Ghana to assess the rate of sediment-bound nutrient export (NE) into five small reservoirs (Dua, Doba, Zebilla, Kumpalgogo and Bugri) and to analyse the implications of this export. The catchment soils and reservoir sediments from the various study sites were sampled and analysed for their bulk density, particle size distribution and nutrient content. Assessment of the nutrient concentrations indicated that the reservoir sediments were richer not only in nutrients and organic carbon, but also in clay and silt, than the catchment soils, having enrichment ratios >1. Nutrient export rates (NE; kg ha?1 year?1) from the reservoir catchments ranged from 0.755 (±0.264) for OC, 0.104 (±0.0245) for N, 0.0020 (±0.0003) for P, 0.016 (±0.0038) for K, 0.009 (±0.0024) for Na, 0.113 (±0.017) for Ca and 0.027 (±0.0093) for Mg. These rates were lower than those of other studies, likely due to the low nutrient content in the catchment soils. The relationships established between NE and specific sediment yield (SSY) indicated the NE was positively correlated with SSY (R2 = 0.66–0.98). The derived empirical equations can be satisfactorily used to predict the quantity of sediment-bound plant nutrients lost from similar catchments and subsequently stored in the reservoir sediments. The study results also suggest the need for sustainable land management practices to forestall erosion in the catchment areas and to reduce reservoir sedimentation, for enhancement of the livelihoods of the communities in the study area.Peer-reviewe

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“…This is consistent with several studies on fertility erosion in Ghana and other parts of the world. (Quansah et al. 2000; Haregeweyn et al.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sediment‐bound nutrient export from five small reservoir catchments and its implications for the Sudan savanna zone of Ghana

et al. 2011

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“…N, P 2 O 5 and K 2 O (kg), respectively by multiplying by the following constants (Quansah et al, 2000) kg N = kg N kg P × 2.29 = kg P 2 O 5…”

Section: Estimation Of Cost Of Nutrients In the Eroded Sediments Usinmentioning

confidence: 99%

“…Drechsel and Gyiele (1999) reported US$ 115.4 million (about 4 -5% of AGDP) as the cost of productivity loss in Ghana. Quansah et al (2000) assessed the seasonal cost of N, P and K lost through erosion under a maize monocrop grown under excessively tilled land (double ploughing + 3 times harrowing + 3 times spike tooth harrowing) to be US$ 7.1 per hectare. In the context of the national economy, the World Bank et al (2006) estimated the cost of land degradation (mainly soil erosion) to range from 1.1 to 2.4 percent of the GDP, corresponding to 2.9 to 6.3 percent of AGDP.…”

Section: Introductionmentioning

confidence: 99%

On-Site Effects and Cost of Fertility Erosion from Five Small Reservoir Catchments in the Upper East Region of Ghana

Amegashie¹,

Quansah²,

Agyare³

et al. 2012

Jnl Sci Tech

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“…Several studies conducted in the country indicates that erosion by water has contributed immensely to the loss of rich soil nutrients from upland soils to low-lying areas (Asiamah et al, 2000;Quansah, 2001;Quansah et al, 2002;Akyea, 2009;Amegashie, 2009). In Ashanti Region for example, reports by Quansah et al (2000) and Adama (2003) indicate that eroded sediments which are transported to low-lying areas contains higher concentrations of soil organic matter and plant nutrients than the soil from which it was eroded.…”

Section: Introductionmentioning

confidence: 99%

Simulation of sediment transport to Sawah rice fields by applying the water erosion prediction project (WEPP) model to a watershed in Ghana

Atakora¹

2013

J. Soil Sci. Environ. Manage.

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Inland valleys are being used under the Sawah technology for rice production to reduce rice imports to Ghana. Sawah technology is assumed to benefit from geological fertilization. However, there is no quantitative information on runoff and sediment flows in the agricultural watershed of Ghana. This study was carried out at Biemso in the southern part of the country. The aim was to estimate runoff and sediment transport using the water erosion prediction project (WEPP) model (version 2006.500), from hillslope to the valley bottom where rice is cultivated using the Sawah technology. A digital elevation model (DEM) was created from ground survey and used to select the various plots (hillslopes) and to select slope input parameters. Four plots (hillslopes) were selected for the model simulation. Data on local daily values of rainfall and on minimum and maximum temperatures were used to set a CLIGEN model station file to determine climate input parameters for the model. Rainfall characteristics (erosivity and distribution) were analysed. Soil erodibility was also determined. Soil and crop management input parameters required by the model were identified and or estimated from field measurements and secondary sources. The model was run for two management scenarios: Fallow and continuous maize systems. The results of the simulation showed that 2.9 to 3.9 and 6.8 to 10.2 t/ha/year of sediments were eroded from upper catchment to valley bottom under fallow system and maize, respectively. The range of values for runoff produced under fallow was 17.4 to 40 mm whereas that under maize system is 158.7 to 233.62 mm. The study has shown that land use system in the study area has a great influence on geological fertilization. In addition, the valley bottom where rice is produced under the Sawah system is enriched with organic matter from upslope.

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Soil fertility erosion and the associated cost of NPK removed under different soil and residue management in Ghana

Cited by 20 publications

References 6 publications

Sediment‐bound nutrient export from five small reservoir catchments and its implications for the Sudan savanna zone of Ghana

Sediment‐bound nutrient export from five small reservoir catchments and its implications for the Sudan savanna zone of Ghana

On-Site Effects and Cost of Fertility Erosion from Five Small Reservoir Catchments in the Upper East Region of Ghana

Simulation of sediment transport to Sawah rice fields by applying the water erosion prediction project (WEPP) model to a watershed in Ghana

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