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Relationships among Plant Available Phosphorus, Fertilizer Sales, and Water Quality in Northwestern Ohio

Frank G. Calhoun*, Jerry M. Bigham and Brian K. Slater

School of Natural Resources, The Ohio State University, Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691-4096



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  		Fig. 1. Location of sample sites in northwestern Ohio.

 


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  		Fig. 2. Frequency histograms demonstrating the effect of log10 transformation on distribution of soil test P in soils of northwestern Ohio. The term Pcu represents the current concentration of P in the Ap horizon and Por represents the original concentration (1953 to 1982) of P in the Ap horizon.

 


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  		Fig. 3. Annual trends in (a) soluble reactive P (SRP) in river water and fertilizer P sales; (b) soil test P and number of soil samples submitted for analysis in northwestern Ohio.

 


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  		Fig. 4. Total annual fertilizer P sales, expressed as elemental P.

 


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  		Fig. 5. Changes over time for (a) the original concentration of Bray-1 phosphorus in the Ap horizon (Por) and the difference between means of the current concentration of Bray-1 phosphorus in the Ap horizon (Pcu) and Po; (b) relative change in Por compared with fertilizer P sales.

 




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The SCI Journals Agronomy Journal Crop Science
Vadose Zone Journal Journal of Plant Registrations
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Copyright © 2002 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.