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Manure or fertilizer can be used to supply the phosphorus (P) needs of crops. However, excess P application increases the risk of P loss from fields and of water quality impairment through increased algae growth. Poor water quality in many Iowa lakes has prompted questions about the impact of P management practices on P loss from fields and the effectiveness of using agronomic soil tests for environmental purposes.

Fertilizer and Swine Manure Management Systems: Impacts on Agronomic and Environmental Soil Phosphorus Tests and on Phosphorus Loss with Subsurface Drainage