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Iowa Manure Management Action Group

Nutrient Source

Description
Research suggests there is little, if any, difference in nitrate leaching or corn yield when using different sources of fertilizer N, provided similar plant-available N application rates are used and management is appropriate for the source. There also is little evidence of P source (i.e., fertilizer compared to manure P) effects on short-term P delivery from fields if the P is incorporated into the soil.

 

Benefits
Research indicates on average a small reduction (4%) in nitrate-N concentration when comparing liquid swine manure to commercial fertilizer N, considering the same crop-available application rate. Besides potential impact on nitrate leaching, some manure sources high in solids content may have a positive impact on soil organic carbon, soil structure, and runoff. Manure compared with inorganic P forms can reduce runoff by increasing soil organic carbon and improving soil structure. If runoff-producing rainfall events occur immediately after P application, significantly less P loss occurs with solid beef and poultry manure, compared with unincorporated commercial fertilizer.

 

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