Impacts of nutrients and pesticides from small- and large-scale agriculture on the water quality of Lake Ziway, Ethiopia

Teklu, Berhan M.; Hailu, Amare; Wiegant, Daniel; Scholten, Bernice S.; Brink, Paul J. Van den

doi:10.1007/s11356-016-6714-1

Cited by 75 publications

(80 citation statements)

References 18 publications

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“…The possible environmental risks have been demonstrated in other studies by Ramo et al (2016) and Teklu et al (2016) in Costa Rica and Ethiopia, respectively. There is, therefore, a need to perform environmental risk assessments of current pesticides use in Ghana to identify pesticides that pose the highest risks to the aquatic environment and to determine threshold levels of the pesticides that are protective of the environment.…”

Section: Farmers' Pesticides Use Practicesmentioning

confidence: 55%

Pesticide registration, distribution and use practices in Ghana

Kwakye

Mengistie²,

Ofosu-Anim

et al. 2018

Environ Dev Sustain

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Ghana has implemented regulation on the registration, distribution and usage of pesticides in order to evaluate their environmental and human health effects. However, environmental monitoring and certified laboratories for pesticide analysis are lacking. Pesticide misuse, misapplication, contamination of the environment and human exposure still continue, and little is known to what extent pesticide registration, distribution and use is properly implemented in Ghana. This study aimed at investigating how the pesticide policy operates in Ghana, how state (policy; national/local) and non-state (importers, dealers' and farmers) stakeholders function, what their challenges are, and to which extend the policy objectives are achieved. A conceptual framework based on the contextual interaction theory (CIT) was developed, and a review of Ghana's pesticide policy implementation with two empirical field studies on state policy and non-state policy actors was conducted, supplemented with secondary data, and a number of interviews conducted with stakeholders and informants were used. Results indicate that pesticides are registered in compliance with the law. Non-state actors scored low with respect to their mandate which likely results in environmental and human health risks. Significant association existed between Electronic supplementary material The online version of this article (https ://doi.org/10.1007/s1066 8-018-0154-7) contains supplementary material, which is available to authorized users. 3educational level attained and knowledge (χ 2 = 3.614; P ≤ 0.05). Work experience or duration of farming also significantly influenced the knowledge of respondents (P < 0.001), as well as attitude (χ 2 = 15.328; P < 0.05). Work experience/duration of farming also significantly influenced attitude at 95% confidence level (P < 0.001), and duration of farming was significantly associated with farm management practices at 5% level of significance (P ≤ 0.05), while state actors are not motivated and resourced. It is recommended to perform preliminary risk assessment to the aquatic environment, to derive threshold levels which are protective of communities, to screen farmers for pesticide exposure and poisoning, to develop well-targeted training programmes for pesticide retailers and farmers on pesticide use, personal protective device use, as well as pesticide management and law. Additionally, pesticide policy implementers have to be motivated and resourced to carry out their mandate, being to execute the pesticide legislation.

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Section: Farmers' Pesticides Use Practicesmentioning

confidence: 55%

Pesticide registration, distribution and use practices in Ghana

Kwakye

Mengistie²,

Ofosu-Anim

et al. 2018

Environ Dev Sustain

Self Cite

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“…() reported that climate change and irrigation on the CRV water system resulted in increased water abstractions. Other studies indicated agrochemicals (e.g., pesticides including DDT and spiroxamine) and heavy metals have been polluting Lake Zeway (Jansen & Harmsen, ; Yohannes et al., ; Teklu et al., ). Data are currently lacking regarding the status and impacts of urban wastes in the study area, although experiences from other towns in the country (e.g., Dessie; Bahir Dar; Hawassa) suggest urban wastes endanger the quality of the available water sources (Desta, ; Beyene et al., ; Tenagne, ).…”

Section: Resultsmentioning

confidence: 99%

“…A linearly increasing temperature was reported by Kassie (); subsequently, also increasing evapotranspiration in the CRV (Getnet et al., ) is a potential factor exacerbating the problem. Increasing demands for the limited water resources, and expansion of irrigated agriculture with intensive use of agrochemicals (Jansen & Harmsen, ) in the area, have also affected the water quality of Lake Zeway (Teklu et al., ).…”

Section: Introductionmentioning

confidence: 99%

Tempo‐spatial land use/cover change in Zeway, Ketar and Bulbula sub‐basins, Central Rift Valley of Ethiopia

2018

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Understanding tempo-spatial dynamics of land-use/cover (LULC) and its drivers is instrumental in synthesizing knowledge for informed natural resource management planning and associated decisions. The present study investigates tempo-spatial LULC changes, their drivers and the associated impacts in three sub-basins (Zeway, Ketar and Bulbula) in the Central Rift Valley (CRV) of Ethiopia. Satellite imageries of different periods in ArcGIS, field observations, focus group discussions (FGDs) and secondary data were used to analyse the LULC dynamics, their drivers and associated impacts from 1973 to 2014. The overall accuracy of 1973, 2003 and 2014 classification maps was 88.7%, 88.9% and 91.6%, respectively. The analysis results revealed a continuous increase of farmland and town built-up areas at the expense of grasslands, shrub-bush land and woodlands. It further indicated area of open irrigated agriculture, increasing from none to 2.61% of the total area. The FGDs demonstrated agricultural land expansion, resettlement and wood extraction were proximate causes of the observed LULC changes. Population increases, changes in land tenure system and decreased farmland productivity were determined to be the underlying causes of the changes. The FGDs further indicated these changes have negatively affected the natural resources. The present study findings indicate the need to reconsider land-use decision tradeoffs between economic, social and environmental demands, and their implications for other similar areas in Ethiopia and beyond. Quantitative analysis and periodic evaluation of the drivers of such change and the impacts of existing and emerging land-uses in the face of changing climate is recommended to facilitate sustainable use of the fragile ecosystems in the Ethiopian CRV. K E Y W O R D S GIS, Lake Zeway, land-cover, land-use, satellite image | 77 ABERA Et Al.

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“…In Table 1, it can be observed that the values EC for both lakes are increasing, furthermore, a study conducted by Teklu et at. [19], the maximum EC value for Ziway lake was streteched to 1740µS/cm , the recent study conducted by Zigide and Tsegaye [20] the maximum value for Hawassa lake has been extended to 1999.4 µS/cm. Both lakes have shown the dramatic changes and exceeding the maximum permissible limit of 1000 µS/cm [17,18].…”

Section: Electrical Conductivity (Ec)mentioning

confidence: 93%

“…The pH values for the two lakes were analyzed in various years. As indicated in Table 1, the mean values of pH for Ziway Lake is in the range of MPL Ethiopian [17] and WHO standard [18], but a study by Teklu et al [19], the maximum values stretched to 9.0. In all years (Table 1), Lake Hawassa is not within the range of MPL.…”

Section: Phmentioning

confidence: 99%

Comparative Assessment of the Water Quality Deterioration of Ethiopian Rift Lakes: The Case of Lakes Ziway and Hawassa

Hailesilassie¹,

Tegaye²

2019

EESRJ

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The Ethiopian Rift Valley Lakes Basin consists of chain of lakes, many feeder streams and wetlands with unique hydrological and ecological characteristics having regional and global environmental importance. With growing population and consequent various human activities and degradation of watersheds aggravated by climatic change, the water quality of rivers and lakes and feeder rivers are deteriorating fast. The purpose of this study is to assess physicochemical water quality parameters in two of relatively fresh water lakes (Ziway and Hawassa) which are occupying in the Central Main Ethiopian Rift floor. These parameters are pH, dissolved oxygen (DO), total dissolved solids (TDS), turbidity (NTU), Electrical conductivity (EC), and fluoride ion concentration(F -). The mean values of those physico-chemical parameters were compared with maximum permissible limit (MPL) for drinking water as standardized by the Ethiopian Ministry of Health (MoH) and the World Health Organization (WHO). The result revealed that most of the parameters show clear deterioration over the last few decades. The likely factors are rapid urbanization, sedimentation, excessive use of fertilizers and industrialization in towns established along their shorelines. Hence, these trends demand immediate intervention to avert the grave environmental consequences.

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Impacts of nutrients and pesticides from small- and large-scale agriculture on the water quality of Lake Ziway, Ethiopia

Cited by 75 publications

References 18 publications

Pesticide registration, distribution and use practices in Ghana

Pesticide registration, distribution and use practices in Ghana

Tempo‐spatial land use/cover change in Zeway, Ketar and Bulbula sub‐basins, Central Rift Valley of Ethiopia

Comparative Assessment of the Water Quality Deterioration of Ethiopian Rift Lakes: The Case of Lakes Ziway and Hawassa

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