LIST OF FIGURES 

 Figure - D age 



1. Rajan's (1978) proposed mechanism of sulfate 



adsorption 25 



2. Sources and sinks of sulfur compounds 31 



3. Annual deposition of total sulfur, 1952 to 1955 and 1978 



to 1979, and the mean pH of rainfall in Florida, 



1978 to 1979 35 



4. Location of soil pedons where samples were collected 



for a survey of sulfur in Florida soils 63 



5. Soil pH buffer curves for four Florida soils 66 



6. Schematic of one experimental unit in the greenhouse 



evaluation of subsoil S in Florida soils 69 



7. Mean distribution of total and extractable sulfate 



sulfur in nine Florida Spodosols 90 



8. Mean distribution of total and extractable sulfate 



sulfur in ten Florida Entisols 96 



9. Mean distribution of total and extractable sulfate 



sulfur in ten Florida Ultisols 102 



10. Total yields of four harvests of sorghum-sudangrass as 



affected by sulfur and subsurface soil horizons 120 



11. The effect of herbage sulfur concentration on relative 



yield of 4-week old sorghum-sudangrass tops 123 



12. The effect of herbage N:S ratio on relative yield of 



4-week old sorghum-sudangrass tops 125 



13. The effect of sulfur and nitrogen rates on the annual 



yield of bahiagrass in a Myakka find sand 129 



14. The effect of sulfur and nitrogen rates on the annual 



yield of bermudagrass on a Kendrick fine sand 141 



