Inderscience Publishers

Impact of agricultural activities on phosphorus in streams draining into Opa Reservoir Ile Ife, Nigeria

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Courtesy of Inderscience Publishers

Phosphorus is noted as the limiting factor of eutrophication. We investigated the impact of different agricultural land use (mixed cropping, horticultural garden and fallow land) on the phosphorus loading of a reservoir. Soil samples were analysed for pH, particle size distribution, organic matter, available P and erodibility index calculated. Water samples analysed for biological oxygen demand (BOD5), dissolved oxygen, phosphate, organic matter and pH. The result shows available phosphorus in the order: fallow land > mixed cropping > horticultural garden. The results suggest that the PO43-in the reservoir maybe due to the effect of the cultivated land around the reservoir. The soil organic matter and available P shows significant patterns of seasonal and profile variations. To prevent runoff from agricultural land to the reservoir, the idea of zero cropping should be encouraged.

Keywords: phosphorus, erosion, reservoirs, land use, agricultural activities, agriculture, streams, Nigeria, water pollution, mixed cropping, horticultural gardens, fallow land, eutrophication, organic matter, soil contamination, runoff, zero cropping

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