JEPJournal of Environmental Protection2152-2197Scientific Research Publishing10.4236/jep.2012.328110JEP-21778ArticlesEarth&Environmental Sciences Physico-Chemical and Bacteriological Quality of the Vegetable Watering Water in the Dschang Town, Cameroon tangmoTsafack Honorine1*TemgouaEmile2NjineThomas3Laboratory of Soil Analysis and Environment Chemistry, Department of Soil Sciences, Faculty of Agronomy and Agricultural Sciences, University of Dschang, PO Box 222 Dschang, CameroonLaboratory of Applied Biology and Ecology,Department of Animal Biology, Faculty of Sciences, University of Dschang, PO Box 67Dschang, CameroonLaboratory of General Biology, Department of Animal Biology and Physiology, Faculty of Sciences, University of Yaoundé I, PO Box 812 Yaoundé, Cameroon* E-mail:tsafackhonorine@yahoo.fr(TTH);210820120308949955June 4th, 2012July 3rd, 2012 August 1st, 2012© Copyright 2014 by authors and Scientific Research Publishing Inc. 2014This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/

Market gardening, in the swampy lowlands of the Dschangcity, plays an important role in terms of providing employment, and supply the city with fresh products. However, waterborne diseases, which occur in the city, are both attributed to the bad quality of drinking water and sanitation practices. This work aims to characterize watering waters of crop, to assess the health risks associated with the use of these waters. Water from eleven streams and five wells used to irrigate crops were sampled and analyzed once a week for a month. Analyses focused on physico-chemical parameters (temperature, suspended matter, pH, electrical conductivity, COD, BOD 5, NO - 3 , Al, Fe, Cu, Ni), parasitological (helminthes eggs) and bacteriological (total coliforms, fecal coliforms, fecal streptococcus). The results show that, the physico-chemical quality of well waters generally approaches the WHO standards of crop watering water. The physico-chemical of streams waters and bacteriological quality of wells and streams waters are bad, according to WHO guide. These bad quality waters could contaminate crops, some of which are eaten raw, which is surely a cause of the outbreak of waterborne diseases in the city. The waters from streams are more affected. The pretreatment of the water before use for irrigation of vegetables is highly recommended.

Watering Water Quality; Urban Market Gardening; Sanitary Risks1. Introduction

Dschang is an university town with rapid demographic growth. This town covers a surface area of more than 1300 hectares, with an estimated population of about 109,556 in habitants [1]. There are many swampy areas in this town which are valorized by the poor for dwelling in one hand and for market gardening in the other hand [2,3]. More than 10 hectares of land are cultivated in these swamps. The most highly produced vegetable include; huckle berry, tomatoes, celery, green pepper, basil, parsley, garden eggs (African aubergine), cabbage, lettuce, green-beans, leeks and carrots. About 96% of these plants are grown by watering while 4% are irrigated in the dry season. This market gardening activity is in rapid expansion within this town, and plays a vital role in the supply of the town with cheap and fresh products. This activity also provides employment for many families generally living under conditions of extreme poverty.

However, the water used for watering of these crops even those likely to be consumed raw is of doubtful qualities, where these harvest crops are sold directly to the city dwellers. The town does not have any wastewater treatment unit, so the streams receive all sorts of wastewaters originating from the city. According to an investigation carried in Dschang, about 10% of water used for watering comes from wells and 90% from untreated water of streams. Some latrines and septic tanks located along these streams are designed in a manner that their contents are emptied directly into these streams. During the rainy season, the water table rises causing floods on the cultivable lands and affecting the physical environment of wells. However, pathogenic microorganisms and chemical compounds present in the flooded waters used for watering can be a source of chemical and micro-biological contamination of the crops, and consequently harmful to the health of the consumers [4]. The potential risks of using untreated wastewater for agriculture were already highlighted [5-7]. Cholera, typhoid fever and paratyphoid epidemics already observed in Dakar and Kampala for example are allotted to the bad quality of water used in watering of crops [8]. The diagnosis made by UN-habitat [9]) and Boon [10] in Dschang proofed some cases of typhoid fever, intestinal parasites and diarrhea as recurrent diseases in the city (19% of 8000 patients listed in 2008). An increasing accusing finger is being pointer to the source of water used in watering vegetables. In addition to poor quality of drinking water, these diseases can also originate from improper hygiene and, consumption of fresh food products soiled by pathogenic micro-organisms. The quality of some water points intended for human consumption in Dschang town is well known [10-13]. Unfortunately, no data is available in regard to the composition and quality of water used in watering the crops. This study is aimed to fill this gap. It is based on the evaluation of sanitary risks related to the use of watering water, provision of helpful elements for decision making so as to ensure a market gardening without risk in Dschang town.

2. Materials and Methods2.1. Water Collection Points

Figure 1 presents the localization of Dschang town in West Cameroun. It also presents the principal sampling points (D). In all, 16 water points used for watering of crops, 5 wells and 11 streams were selected on 10 principal market gardening sites of the town (Fiala-Foto, Tapalé, Tsinkop, Tsenfem, Ngui, Minghong, Tchoualé, Vallée, Administratif, Fiala-Foréké).

ReferencesINS, “Annuaire Statistique du Cameroun,” Institut Na- tional de Statistique, Yaoundé, Cameroun, 2006.H. Ntangmo Tsafack, E. Temgoua and T. Njine, “Le Mara?chage urbain à Dschang: Exploration des sites de Mara?chage et Identification des Pratiques Culturales,” Actes du Colloque Scientifique (CAFOBIOS), Dschang, du 14 au 15 Mai 2009, pp. 49-53.E. Temgoua, H. Ntangmo Tsafack and T. Njine, “Vegetable Production Systems of Swamps Zone in Urban Environment in West Cameroon: Case of Dschang City,” Universal Journal of Environmental Research and Technology, Vol. 2, No. 2, 2012, pp. 83-92.D. Mara and S. Cairncross, “Guide pour l’Utilisation sans Risques des eaux Résiduaires et des Excréta en Agricul- ture et Aquaculture,” OMS-PNUE, Genève, Suisse, 1991, 202 p.G. Cissé, “Impact Sanitaire de l’Utilisation d’eaux Polluées en Agriculture Urbaine: Cas du Mara?chage à Ouagadougou (Burkina Faso),” Thèse No 1639, Ecole Polytechnique Fédérale de Lausane, Suisse, 1997.P. Amoah, P. Drechsel, R. Abaidoo and M. Henseler, “Irrigated Urban Vegetable Production in Ghana: Micro-biological Contamination in Farms and Markets and Associated Consumer Risk Groups,” Journal of Water and Health, Vol. 5, No. 3, 2007, pp. 455-466. doi:10.2166/wh.2007.041M. L. Ndiaye, S. Niang, H.-R. Pfeifer, R. Peduzzi, M. Tonolla and Y. Dieng, “Effect of Irrigation Water and Processing on the Microbial Quality of Lettuces Produced and Sold on Markets in Dakar (Senegal),” Irrigation and Drain, Vol. 60, No. 4, 2011, pp. 509-517. doi:10.1002/ird.590M. Gaye and S. Niang, “Epuration Extensive des eaux usées pour leur Réutilisation dans l’Agriculture Urbaine: Des Technologies Appropriées en Zone Sahélienne pour la lutte Contre la Pauvreté,” Etudes et Recherches, 225- 226-227, ENDA, Dakar, 2002, pp. 17-20.ONU-HABITAT, “Municipalité de Dschang: Une ville au passé Glorieux face aux Nouveaux Défis,” 2005, Résumé 23 p.N. Boon, “Environmental Burden of Water Borne Disease in Dschang, Western Province-Cameroon: Health Impacts and Causal Factors,” Breaking Ground Report, 2008, 34 p.ERA, Cameroun, “Diagnostic de l’Approvisionnement en eau et de l’Assainissement dans la ville de Dschang,” CUD, 2005, 107 p.E. Temgoua, E. Ngnikam and B. Ndongson, “Drinking Water Quality: Stakes of Control and Sanitation in the Town of Dschang-Cameroon,” International Journal of Biology and Chemical Sciences, Vol. 3, 2009, pp. 441- 447.E. Temgoua, “Chemical and Bacteriological Analysis of Drinking Water from Alternative Source in the Dschang Municipality, Cameroon,” Journal of Environmental Protection, Vol. 2, No. 5, 2011, pp. 620-628. doi:10.4236/jep.2011.25071INNORPI, “Institut National de la Normalisation et de la capacité Industrielle de Tunisie. Normes de rejet dans un milieu hydrique,” NT, 1989. www.inorpi.ati.tn.rFAO, “Irrigation avec des eaux usées Traitées, Manuel d’Utilisation,” 2003, 73 p.J. Adouli, C. Abdelkader, C. Abdelhafid and B. Ali, “Suivi et Analyse du Risque lié à l’Utilisation des eaux usées en Agriculture dans la Région de Meknès au Maroc,” Sud Sciences et Technologie, Vol. 16, 2008, 29-35.Z. Derwich, E. Beziane, L. Benaabidate and D. Belghyti, “Evaluation de la Qualité des eaux de Surface des Oueds et Sebou Utilisées en Agriculture au Maroc,” Larhyss Journal, Vol. 7, 2008, pp. 59-77.L. Ndiaye, “Impact Sanitaire des eaux d’Arrosage de l’Agriculture Urbaine de Dakar (Sénégal),” Thèse de Doctorat, Université de Genève, 2009, 166 p.C. Haslay and H. Leclers, “Microbiologie des eaux d’Alimentation,” Technique et document Lavoisier éd., Paris, 1993.OMS, “L’utilisation des eaux Usées en Agriculture et en Aquaculture: Recommandations à avisées Sanitaires. Organisation Mondiale de la Santé. Série de Rapports Techniques,” No 778, OMS, Genève, 1989.P. Amoah, P. Drechsel and R. Abaidoo, “Irrigated Urban Vegetable Production in Ghana: Sources of Pathogen Contamination and Health Risk Elimination,” Irrigation and Drainage, Vol. 54, No. S1, 2005, pp. 49-61. doi:10.1002/ird.185U.Peasey, M. Blumenthal, ruiz-palacios, “A Review of policy and Standards for Wastewater Reuse in Agriculture a Latin American Perspective,” WELL Study, No 68, Part II, 2000. http://www.lboro.ac.uk/well/M. Nola, “Qualité Bactériologique des eaux Souterraines de Yaoundé: R?le du sol dans le Transfert à la Nappe Phréatique des Bactério-contaminants de l’eau d’Infiltration,” Thèse de Doctorat d’Etat, Univ. Yaoundé 1, Cameroun, 2005, 144 p.