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Published online 5 January 2006
Published in J Environ Qual 35:240-252 (2006)
DOI: 10.2134/jeq2005.0246
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Nitrogen and Phosphorus Status of Soils and Trophic State of Lakes Associated with Forage-Based Beef Cattle Operations in Florida

G. C. Siguaa,*, M. J. Williamsb, S. W. Colemana and R. Starksc

a USDA-ARS, Subtropical Agricultural Research Station, Brooksville, FL 34601
b USDA-NRCS, 2614 NW 43rd Street, Gainesville, FL 32606-6611
c Resources Data Section, Southwest Florida Water Management District, Tampa, FL 33637



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  		Fig. 1. Location of the study sites and aerial view of the Subtropical Agricultural Research Station (STARS), Brooksville, Hernando County, FL.

 


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  		Fig. 2. Average monthly and annual rainfall and the 50-yr rainfall average, and average air temperature at Brooksville, FL.

 


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  		Fig. 3. Annual level (mean ± SD) and rate of decline for soil P and K in a forage-based beef cattle pasture system.

 


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  		Fig. 4. Annual level (mean ± SD) and rate of decline for soil Ca and Mg in a forage-based beef cattle pasture system.

 


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  		Fig. 5. Annual level (mean ± SD) and rate of decline for soil pH in a forage-based beef cattle pasture system.

 


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  		Fig. 6. Generalized schematic showing different nutrient compartments in a forage-based pasture systems.

 


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  		Fig. 7. Total nitrogen (TN) to total phosphorus (TP) ratio of lakes associated with a forage-based beef cattle pasture system.

 


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  		Fig. 8. Trophic state index for lakes associated with a forage-based beef cattle pasture system. Trophic state index is significantly different (P ≤ 0.05) when superscripts located at top bars are different.

 




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