Potential effect assessment of agricultural activities on water quality of rivers in Rwanda: “Case of Muvumba River in Nyagatare District”

Abstract The problem caused by agricultural sector to Water Quality pollution remains a big challenge for Rwanda Government. The general objective of the study was to assess the potential effect of agricultural activities on water quality in Nyagatare District. Specifically, the study assessed agricultural activities in around Muvumba River, examine the level of water quality pollution in Muvumba River, and reveal the relationship between agricultural activities and water quality from Muvumba River. Data collected through interview, and laboratory tests of water samples applied once per month in three points sampling of Muvumba River. The action starting from 19th March 2019 up to 20th March 2020. To determine the correlation between agricultural input and Water Quality data at all selected physic-chemicals parameters, by Linear Regression Model using SPSS statistics with 95% confidence interval. The results indicated that agricultural activities on surrounding of Muvumba River, are presented by the existence of different type of crops, non-protection of anti-erosions, non-wetland margins, the farmers using chemical fertilizers and pesticides, the results revealed also that all selected parameters have not addressed positive relationship or pollution, but many of them did, as per to Rwanda Standards Board guidelines. For sampling point one has taken as baseline because it is upstream of Muvumba river at Nyagatare District, in sampling point 2, the parameters that presented pollution were; turbidity (r=0.193), nitrites (r=0.393), iron(r=0.122), manganese (r=0.008); for the sampling point3: were pH (r=0.319); turbidity (r=0.212); nitrites (r=0.143); nitrates (r=0.618); nitrogen ammonia (r=0.441); Iron(r=0.889); manganese (r=0.269); agricultural activities in surrounding of Muvumba River have significantly contributed to the water quality pollution of Muvumba River, through substances of chemical fertilizers, crop residues, and soil sediments that are transported into the River by erosion. Conclusion of the study that creation of anti-erosions in a surrounding Muvumba River areas, protection of buffer zones, performing vegetation covers, inducing water management bodies at cells level, introducing awareness of farmers how ecosystem functions.

Keywords— Agricultural activities, Water quality, Water pollution, Muvumba River.

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International Journal of Environmental and Agriculture Research (IJOEAR)

ISSN: 2454-1850

Digital Object Identifier DOI: 10.25125/agriculture-journal

WorldCat , Scilit, MDPI AG (Basel, Switzerland), Tyndale University College & Seminary, Indiana University,
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