61 

 reports of S deficiencies on crops within the state. Although these 

 workers clearly demonstrated the need for S on crops on most of 

 Florida's sandy soils, little attention has been devoted to this nutri- 

 ent. Less S is applied through fertilizers, but more is reaching the 

 soils through precipitation and direct S0„ adsorption. Yields of most 

 field crops have doubled, and in some cases, tripled since the 1950' s. 

 New, higher-yielding varieties and even some new crops have been 

 introduced to Florida farms. Management practices have changed dra- 

 matically, and fertilization is more intense. A re-evaluation is 

 needed of the S fertility status of Florida soils to determine if crop 

 yields can be improved by S fertilization during the 1980's, and to 

 identify the sources and availability of soil S in Florida. 



