Once P concentrations in soil have accumulated over time, effective mitigation strategies exist to reduce leaching. Depletion of soil P by ceasing further additions of P to soil and seasonally exporting P in harvest crop biomass (also referred to as "mining" or "photomining") has been suggested as an effective remediation strategy to decrease the risk of P leaching from P. -enriched so In a field experiment in the Netherlands, P concentration in soil solution in the upper soil layer was lowered by 30 to 90 in just 5 years. The authors suggested that long-term phytomining could be effective in decreasing P loss via leaching and surface runoff. other studies suggest the once P has accumulated above crop requirement, a considerable lag-time may exist between the initiation of mining strategies and significant reduction in soil P In a 10 year field study in Maryland, United State, on soils with 300 to 500 mg. Mehlich-3 P kg, Kleinman et al. observed no significant differences in Mehlich-3 P over time between poultry litter application treatments of 0,40, or 80 kg P ha y During the study period,.