African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6863

Full Length Research Paper

Assessment of farming practices and uses of agrochemicals in Lake Manyara basin, Tanzania

Nonga, H. E.1,2*, Mdegela, R. H.1, Lie, E.2, Sandvik, M.3 and Skaare, J. U.2,3
   1Sokoine University of Agriculture, P. O. Box 3021, Morogoro, Tanzania. 2Norwegian School of Veterinary Science, P. O. Box 8146, Dep., 0033, Oslo, Norway. 3National Veterinary Institute, P. O. Box 750, Sentrum, 0106, Oslo, Norway.
Email: [email protected], [email protected]

  •  Accepted: 05 April 2011
  •  Published: 31 May 2011



This study was conducted to assess farming practices, agrochemical usage and environmental pollution in Manyara basin, Tanzania. Field surveys, interviews, questionnaires and Lake Manyara nutrient analysis were used in data collection. The highestnumber (95%) of households grew crops, namely, maize, rice, banana and vegetables with median farm size of 3 ha. Irrigated farming was common (75%) which enhanced cultivation on same piece of land up to 6 times a year. Farmers indiscriminately used pesticides, namely, insecticides (50%), fungicides (37.5%) and herbicides (12.5%). Uses of endosulfan in vegetable farms poses public health threats to consumers. Most respondents (85%) applied insecticides in vegetables up to 4 times per cropping season. Excessive use of pesticides and haphazard disposal of pesticide remnants and containers caused environmental pollution. The average amount of acaricides used was 1109±915 ml (mean ± SD) per livestock keeper per month per. Most farmers (78%) used inorganic fertilizers and animal manure (43.4%). Low levels of ammonium (3.6±3.1 µg/L), nitrate (1±0.8µg/L) and phosphate (36.1±42 µg/L) were recorded in the lake. Easy access to agrochemicals, limited knowledge of pesticide on environmental health and limited extension services were factors for indiscriminate uses of agrochemicals. Increasing farmers awareness and training aimed at sustainable agriculture, agrochemical uses and integrated pest management is suggested.  


Key words: Fertilizers, irrigation, pesticides, unsustainable agriculture, vegetables.