Developing and Using the Iowa P-Index

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2003-01-01
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Sawyer, John
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Sawyer, John
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Agronomy
Abstract

Movement of phosphorus (P) from farm fields to surface waters can elevate P above critical levels for aquatic plant growth and thus enhance nutrient enrichment and seasonal deficient oxygen, a process called eutrophication. Phosphorus commonly controls vegetative production in freshwater bodies, and hence the potential for eutrophication. The sourcing of P from production fields (including P from soil, manure, and fertilizer) is one area identified as being an important contributor of total P entering surface waters, and hence significantly contributing to water quality concerns. In recent years considerable effort has focused on developing methods to assess risk of P loss from production fields to surface water systems.

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Wed Jan 01 00:00:00 UTC 2003