Impact of Chemical Amendment of Dairy Cattle Slurry on Soil Phosphorus Dynamics Following Application to Five Soils

R. B. Brennan, D. P. Wall, O. Fenton, J. Grant, A. N. Sharpley, M. G. Healy
2014 Communications in Soil Science and Plant Analysis  
A nine month incubation study was conducted to investigate the effectiveness of amending dairy cattle slurry with either alum, lime, poly-aluminum chloride (PAC), or ferric chloride (FeCl 3 ), in reducing water extractable P (WEP) levels in five soils (four mineral and one organic). Alum, lime, and PAC were the most effective amendments in decreasing WEP (compared to a slurrycontrol) for the four mineral soils (by an average of 47% at the end the 9-month incubation period). In comparison, FeCl
more » ... n comparison, FeCl 3 increased WEP (compared to the slurry-control) by an average of 35% at the end the study. None of the amendments examined effectively reduced WEP of the organic soil. No amendment reduced soil test P [(Morgan's P (P m ) and Mehlich-3 P (M3P)] compared to the soil-only treatment. Alum maintained the highest levels of M3P across the four mineral soils with the least risk of P loss to overlying water.
doi:10.1080/00103624.2014.912293 fatcat:i3tr4g5x2veydikretww5vuteu