70 

 matter yields were calculated within each harvest and soil series. The 

 highest yielding treatment was assigned a relative yield of 100%. 



All pots were fertilized with 50 ppm N and 50 ppm K after the 

 first, second, and third harvests. After the third harvest, 50 ppm P 

 as Ca(H 7 P0, ) „ • 2H and 1/2 of the original micronutrient rats were 

 applied to all pots. 



An infestation of red spider mites warranted spraying with 

 Kelthane(TM) after the second harvest. The chemical spray caused 

 severe "burning" of the foliage of most plants. The plants recovered 

 rapidly from the damage, and yields from the third harvest were not 

 affected. 



After the fourth harvest, soil was washed from the roots with tap 

 water; the roots were rinsed in distilled water, dried, and weighed. 

 4.3 SULFUR IN BAHIAGRASS AND BERMUDAGRASS 



In the spring of 19 78, two experiments were begun to study the 

 response of bahiagrass ( Faspalum notatum Flugge 'Pensacola') and ber- 

 mudagrass ( Cyncdon dactylon L. 'Coastcross-1' ) to S fertilization in 

 the field. The bahiagrass experiment was located at the 3eef Research 

 Unit, approximately 16 km northeast of Gainesville, on a Myakka fine 

 sand: the bermudagrass experiment was located at the Green Acres 

 Agronomy Farm, approximately 16 km west of Gainesville, on a Kendrick 

 fine sand (loamy, siliceous, hyperthermic, Arenic Paleudult) . The 

 experiments were located in established fields of bahiagrass and 

 bermudagrass which had not been fertilized for several years. 



Dolomitic limestone was applied at the rate of 4,500 kg/ha 

 1 month before initial fertilizer treatments were begun. Phosphorus 

 and K were applied uniformly to all plots in four applications during 



