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DANIELS D, DANIEL T, CARMAN D, MORGAN R, LANGSTON J and VANDEVENDER K (2011) Soil Phosphorus Levels: Concerns and Recommendations. University of Arkansas, Department of Agriculture Cooperative Extension Service. URL: http://www.sera17.ext.vt.edu/Documents/Soil_P_Levels_Concerns_and_Recommendations.pdf (Accessed January 2011).

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