Impact of agricultural activities on phosphorus in streams draining into Opa Reservoir Ile Ife, Nigeria
by J.O. Olowoyo; I.E. Ofoezie; A.A. Amusan
International Journal of Environmental Engineering (IJEE), Vol. 5, No. 1, 2013

Abstract: 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.

Online publication date: Thu, 07-Nov-2013

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