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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 highest number (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. |
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