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Abstract
The importance of managing agricultural phosphorus (P) to protect water quality was addressed in module I. Factors contributing to P loss from the land to surface waters include site and management factors (source factors) and transport factors. An interaction of source and transport factors is needed to have runoff P loss. If one set contributes minimally to risk, then risk is not likely to be great even if the other set of factors offers much potential for risk. This raises the concept of “critical source area”; the risk is greatest when both the source and transport factors are high. This lesson describes how the source factors, including soil characteristics and management practices, affect P delivery to surface waters. Crop producers have some control over these factors, and management practices are discussed. This is a lesson in a series found in the Plant and Soil Sciences eLibrary (http://plantandsoil.unl.edu). Upon completion, a student should be able to:
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