Soil test phosphorus dynamics in animal waste amended soils: Using P mass balance approach

► Both soils and P sources influenced the rates of change in STP at time zero (T0). ► Animal manures from ruminants resulted in larger slope in most soils at T0. ► The Turkey litter had lowest rate of change in STP in most soils at T0. ► The slope decreased from higher to lower rate of P application in mass balance study.