Abstract
A primary objective of phosphorus (P) management is to maintain optimal levels of P in the soil solution at the root surface. Potato plants typically have low root density, resulting in higher solution P concentration needs and critical soil test levels than most other common crop plants. The chemistry of P in fertilized soils makes maintaining these high P concentrations a challenge. Phosphorus has a very high affinity for the soil solid phase with iron (Fe) and aluminum (Al) dominating reactions in moderately acid soils and calcium (Ca) in alkaline soils. Guidelines for P stewardship for potato production are: (1) adopt practices that develop soil conditions that favor root growth and development; (2) make source, rate, time and placement decisions for nutrient applications that maintain optimal soil solution P concentrations during critical growth stages; and (3) use soil and water conservation practices to minimize P losses from the root zone and the field.
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