Impacts of Pollutants (Phosphorus and Nitrogen) from Agricultural Activities on the Soils and Waters of Toho Lake (Benin)
International Research Journal of Pure and Applied Chemistry, Volume 24, Issue 1,
We evaluated the impacts of agricultural activities on the cultivated soils around Lake Toho as well as the waters from the streams through phosphorus, nitrogen and potassium pollution of the soils and waters from the streams heading towards Lake. In the soil, pHwater and pHKCl organic matter, moisture total phosphorus and its fractionation were determined. The various supernatants obtained are analyzed using a 1600PC UV spectrophotometer as well as the waters for the determination of ammonium, nitrite, nitrates and phosphate. In soils, the determination of ammonium, nitrite, nitrate, phosphate and potassium was carried out by DR 5000 MP-AES spectrometry method. Soils around this lake are weakly acidic with an average water pH of 6.91. The humidity increases from surface to depth (8% to 28%), while organic matter (11% on average) and organic carbon decrease from surface to depth. These soils are rich in phosphorus with an overall average concentration of 10.10 mg/g. The fractionation made it possibe to extract the following forms of phosphorus in soil in the order: P-residual > P-org&Al > P-Ca > P-Fe > P-Labile. The physicochemical analysis of the waters show that these waters are moderately loaded and present an increased risk of eutrophication with multifaceted consequences. In soils, nitrate is the dominant form of nitrogen. Cultivated soils provide an abundant source of nitrogen and phosphorus nutrients to Lake Toho via its recharge sources.
- Lake Toho
- stream waters
How to Cite
Li DP, Wu ZJ. Impact of chemical fertilizers application on soil ecological environment. Ying Yong Sheng Tai Xue Bao. 2008; 19(5):1158-65. PMID 18655608
Souidi R. Recovery of phosphorus from wastewater in the form of vivianite using the electrocoagulation method. LAVALE University. 2021;120 .
Moustaka-Gouni M, Sommer U. Effects of harmful blooms of large-sized and colonial Cyanobacteria on aquatic food webs. Water. 2020;12(1587):19. DOI: 10.3390/w12061587
Evelyne K. Contribution to the study of organic and nitrogen pollution of the waters of the Toho in the department of Mono; Abomey-Calavi University. 2008;84. Available: http://biblionumeric.epac-uac.org:8080/jspui/handle/123456789/499.
Gbaguidi GJ. Contribution to the protection against chemical pollution of a lentic system in the tropical region of Lake Toho in South Benin. Africa: West. 2018;95.
Topanou N, Gbaguidi JG, Essegbemon A, Josse RG, Mama D, Aminou T. Assessment of some heavy metals in fresh fish (Oreochromis aureus): case of Toho lake in South Eastern Benin, West Africa. J Geosci Environ Prot. 2020;08(3):159-72. DOI: 10.4236/gep.2020.83012
AFNOR. Soil quality, AFNOR Edition,. 1994;250.
Jackson TFC, Ivissi AE, Soil Chem DFB. Analysis, prentice hall Inc. Engle works cliffs. NJ. 1984;498.
Gachter R, Tessier A, Szabo E, Carignan R. Measurement of total dissolved phosphorus in small volumes of iron rich interstitial water. Aquat Sci. 1992:54.
Rydin E, Welch EB. Aluminum dose required to inactivate phosphate in lake sediments. Water Res. 1998;32(10):2969-76. DOI: 10.1016/S0043-1354(98)00055-4
Ifremer. Update of indicators of the level of eutrophication of Mediterranean lagoon environments – final report-09-2000, (Volume I – 236p) (Volume II – 196p); 2000.
Gérard F. Clay minerals, iron/aluminum oxides, and their contribution to phosphate sorption in soils_ A myth revisited. Geoderma. 2016;262:213-26. DOI: 10.1016/j.geoderma.2015.08.036
Li H, Futch SH, Stuart RJ, Syvertsen JP, McCoy CW. Associations of soil iron with citrus tree decline and variability of sand, soil water, pH, magnesium and Diaprepes abbreviatus root weevil: Two-site study. Environ Exp Bot. 2007;59(3): 321-33. DOI: 10.1016/j.envexpbot.2006.04.005
Ayola PD. Fractionation, bioavailability and mobility of phosphorus in agricultural soils of the Mekrou River watershed; 2022.
Amonmide I, Dagbenonbakin G, Agbangba CE, Akonkpe P. Contribution to the assessment of the level of soil fertility in cotton-based cropping systems in Benin; 201915. Article INRAB.
Yuan H, Wang H, Zhou Y, Jia B, Yu J, Cai Y et al. Water-level fluctuations regulate the availability and diffusion kinetics process of phosphorus at lake water–sediment interface. Water Res. 2021;200: 117258. DOI: 10.1016/j.watres.2021.117258, PMID 34058482
Daouda M, Martin A, Christophe K, Lyde T, Waris C, Odilon C et al. Phosphorus fractionation of surface sediment of lake Nokoue in Benin. J Appl Biol Sci. 2011;45;17:3032-44.
Tometin ASL, Mama D, Zogo ND, Boukari O, Bawa LM. Eutrophication, sediment phosphorus fractionation and short-term mobility study in the surface and under profile sediment of a water dam. J Appl Sci Around Manag. (Okparadam. Africa. Benin: West). 2013;17(4):517-26.
Chouti WK, Atchichoe W, Tometin L, Daouda M. Bioavailability and mobility of phosphorus in sediments of the Porto-Novo lagoon. J App Bioscience. 2017; 114(1):13. DOI: 10.4314/jab.v114i1.1.
Dutheil C. Soil depollution by extraction under reduced pressure: study of some parameters; ([doctoral dissertation]. Lyon: INSA); 2003.
Dyer B. On the analytical determination of probably available mineral plant food in soils. J Chem Soc. 1894;65:115-67.
Anato IF,. Influence of agricultural activities on the chemical quality of cultivated soils in the Benin sub-basin of the Niger River [Master’s thesis]. 2021;62.
Savci S. Investigation of effect of chemical fertilizers on environment. APCBEE Procedia. 2012;1:287-92. DOI: 10.1016/j.apcbee.2012.03.047
Trinquier C. The risk of eutrophication of Mediterranean lagoons: the case of the Thau lagoon (Hérault). Master 1 professional Management of disasters and natural risks. Paul Valery University; 2009.
Thomann RV, Mueller JA. Principles of surface water quality modeling and control. New York: Harper & Row; Pub., Inc; 1987.
Abstract View: 47 times
PDF Download: 30 times