Phosphorus Mobility in a Soil with Long Term Manure Application

Abimbola Ojekanmi, Dupe Ige, Xiying Hao, Oluwole Akinremi

Abstract


The objective of this experiment was to determine the movement of different forms of phosphorus (P) in a clay loam soil with 33 years of manure application at the rate of 0, 30, 60 and 120 Mg ha-1yr-1. Soil samples were taken from 3 soil layers and subjected to leaching in packed soil column. Leachate was analyzed for total (Pt), inorganic (Pi) and organic P (Po). Inorganic P accounted for about 70% of leachate Pt. About 50% of Pt in leachate was lost within the first 5 pore-volume (PV). While 2% of soil total P was lost in 20 PV of leachate from the control soil, 5-7% was lost from the manure amended soil. The amount of P lost in the leachate increased with the rate of manure application but decreased with soil depth. This column leaching study showed that P could be lost through leaching especially at high rate of manure application. Irrigation activity enhanced in situ movement of P down the soil profile.


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Journal of Agricultural Science ISSN 1916-9752 (Print) ISSN 1916-9760 (Online)

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