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Research ArticleResearch

A phosphorus budget for Wisconsin cropland

L.G. Bundy and S.J. Sturgul
Journal of Soil and Water Conservation July 2001, 56 (3) 243-249;
L.G. Bundy
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S.J. Sturgul
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ABSTRACT:

Phosphorus budget information far Wisconsin cropland was compiled between 1970 and 1995 in order to identify changes and trend in budget parameters through time. The main P inputs were animal manure and commercial fertilizer, and the major P removals were crop uptake and loss through runoff and erosion. The difference between inputs and removals was accounted for as a change in the amount of P stored in the soil. Phosphorus inputs from manure have decreased from a high of 120 million lbs (54.5 million kg) in 1975 to about 98 million lbs (44.5 million kg) in 1995. Since 1985, inputs from P fertilizers have decreased by about 30%. Phosphorus removals through crop uptake have increased since 1970 due to increased crop yields. Estimated annual P losses in runoff and erosion represent about 1.4% of the P applied each year or an average loss of about 0.32 lb P ac−1 (0.36 kg P ha−1) of cropland Excess P additions to cropland have decreased by 74% since 1975, with the 1995 excess amounting to 31 million 16 (14.2 million kg) of P, or 3.3 lb of P ac−1 (3.7 kg of P ha−1) of cropland. Most of this decrease is due to reduced use of P fertilizers and increased crop removal of P due to higher yields. Most of the excess P input contributes to increased amounts of P stored in soils. This change in storage of soil P is confirmed by the increasing average soil test P values for the state.

Footnotes

  • Larry G. Bundy is a professor and extension soil scientist at the University of Wisconsin-Madison. Scott J. Sturgul is a nutrient management specialist with the Nutrient and Pest Management Program at the University of Wisconsin-Madison.

  • Copyright 2001 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 56 (3)
Journal of Soil and Water Conservation
Vol. 56, Issue 3
Third Quarter 2001
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A phosphorus budget for Wisconsin cropland
L.G. Bundy, S.J. Sturgul
Journal of Soil and Water Conservation Jul 2001, 56 (3) 243-249;

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A phosphorus budget for Wisconsin cropland
L.G. Bundy, S.J. Sturgul
Journal of Soil and Water Conservation Jul 2001, 56 (3) 243-249;
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