E. J. Bowers, A. C. Hammond, C. C. Chase, Jr., and T. A. Ol-son, “Effect of breed on indicators of heat tolerance and grazing activity in lactating Angus and Brahman cows in Florida”. J. Anim. Sci. 73(Suppl. 1): 131. 1995.
 A. C. Hammond and T. A. Olson, “Rectal temperature and grazing time in selected beef cattle breeds under tropical sum-mer conditions in subtropical Florida”. Trop. Agric. (Trinidad) 71:128-134, 1994.
 B. W. Mathews, L. E. Sollenberger, V. D. Nair and C. R. Sta-ples, “Impact of grazing management on soil nitrogen, phos-phorus, potassium, and sulfur distribution”. J. Environ. Qual. 23:1006-1013, 1994.
 B. W. Mathews, J. P. Tritschler, J. R. Carpenter and L. E. Sol-lenberger, “Soil macronutrients distribution in rotationally stocked kikuyugrass paddocks with short and long grazing pe-riods”. Commun. Soil Sci Plant Anal. 30: 557-571, 1999.
 R. J. Haynes, “Competitive aspects of the grass-legume asso-ciation”. Adv. in Agron. 33:227-261, 1981. R. J. Haynes and P. H. Williams, “Nutrient cycling and soil fertility in grazed pasture ecosystem”. Adv. in Agron. 49:119-199, 1993.
 J. O. Klemmendson, J. O. and A. R. Tiedemann, “Effects of nutrient stress”. p. 414-439. In D.J. Bedunah and R. Sosebee (eds.). Wildland Plants: Physiological Ecology and Develop-mental Morphology. Society of Range Management, Denver, CO. 1995.
 A. J. Franzluebbers, J. A. Stuedeman, and H. H. Schomberg, “Spatial distribution of soil carbon and nitrogen pools under grazed tall fescue”. Soil Science Society of America Journal 64(2):635-639, 2000.
 S. L. White, R. E. Sheffield, S. P. Washburn, L. D. King and J. T. Green Jr., “Spatial and time distribution of dairy cattle ex-creta in an intensive pasture systems”. J. Environ. Qual. 30:2180-2187, 2001..
 P. R. Peterson and J. R. Gerrish, “Grazing systems and spatial distribution of nutrients in pastures: Livestock management consideration”. In R. E. Joost and C. A. Roberts (ed). Nutrient cycling in forage systems. Potash and Phosphate Inst. Manhat-tan, KS. pp. 203-212, 1996.
 A. B, Botcher, T. K. Tremwel, and K. L. Campbell, “Phospho-rus management in flatwood (Spodosols) soils”. p. 405-423. In Reddy, K.R, et al. (eds.) Phosphorus Biogeochemistry in Sub-tropical Ecosystems. Lewis Publishers. Boca Raton, FL. 1999.
 G. C. Sigua, J. S. Steward and W. A. Tweedale, “Water quality monitoring and biological integrity assessment in the Indian River Lagoon, Florida I. Status and trends (1988-1994)”. Jour. Environ. Mgt. 25: 199-209, 2000.
 H. H. Schomberg, J. A. Stuedemann, A. J. Franzlueber and S. R. Wilkinson, “Spatial distribution of extractable phosphorus, potassium, and magnesium as influenced by fertilizer and tall fescue endophyte status”. Agronomy Journal 92(5): 981-986, 2000.
 A. G. Hyde, L. Law, Jr., R. L Weatherspoon, M. D. Cheney and J.J. Eckenrode, “Soil survey of Hernando County, FL”. USDA-NRCS, Washington, DC and University of Florida, Gainesville, FL. 152 p., 1977.
 D. B. Beegle, “Soil fertility management”. In: The Agronomy Guide. F. Martz (ed) Publications Distirbution Center, College of Agricultural Sciences, The Pennsylvania State University , University Park, PA., 2000, pp. 19-42.
 J. T. Sims, R. O. Maguire, A. B. Leytem, K. L. Gartley and M. C. Pautler, “Evaluation of Mehlich-3 as an agri- environmental soil phosphorus test for the Mid-Atlantic United States of America”. Soil Sci. Soc. Am. J. 66: 2016-2032, 2002.
 D. Cluzeau, F. Binet, F. Vertes, J. C. Simon, J. M. Riviere, and P. Trehen, “Effects of intensive cattle trampling on soil-plant-earthworms system in two grassland types”. Soil Biol. Biochem 24(12): 1661-1992. 1992.
 R. O. Maguire, T. D. Jickells and M. J. Wilson, “Influence of cultivation on the distribution of phosphorus in three soils from NE Scotland and their aggregate fractions”. Soil Use Manage. 14:147-153. 1998.
 P. S. Hooda, A. R. Rendell, C. C. Edwards, P. J. Withers, M. N. Aitken and V. W. Truesdale, “Relating soil phosphorus indices to potential releases to water”. J. Environ. Qual. 29:1166-1171, 2000.
 R. O. Maguire, J. T. Sims and R. H. Foy, “Long term kinetics for phosphorus sorption-desorption by high phosphorus soils from Ireland and the Delmarva Peninsula, USA”. Soil Sci. 166:557-565, 2001.
 G. P. Heckrath, C. Brookes, P. R. Poulton and K. W. T. Gould-ing, “Phosphorus leaching from soils containing different phosphorus concentrations in the Broadbalk experiment”. J. Environ Qual 24:904-910, 1995.