ACKNOWLEDGIffiNTS 



This research has been completed because of the help of a great 

 number of people. The supervision and assistance from the members of 

 the author's graduate committee, Dr. R. D. William, former chairman, 

 Dr. D. N. Maynard, present chairman, and Dr. W. G. Blue, Prof. L. H. 

 Halsey, Dr. S. R. Kostewicz, Dr. G. M. Prine, and Dr. G. B. Wall are 

 gratefully acknowledged. Dr. William served as chairman of the super- 

 visory committee for the entire course of the research and graduate 

 trairj.ng prograjn and helped stimulate an environment conducive to the 

 author's academic development. The author appreciates the interest 

 and willingness of Dr. D. N. Mavnard who served as chairman of the 

 supervisory committee after Dr. William left the Vegetable Crops Depart- 

 ment. The help and guidance of Dr. William and Dr. Maynard in develop- 

 ing and improving the author's skill in writing are highly appreciated. 

 The helpful suggestions and assistance of Prof. Halsey in the conduct 

 of the field experiment are gratefully acknowledged. 



Acknowledgments are due also to Mr. L. G. Bryant, and other 

 technicians of the Horticultural Unit and Soil Science Department 

 Testing Laboratory who helped and assisted the author in conducting 

 field work and analysing soil samples. The author is thankful to Dr. 

 N. Gammon, and Dr. W. G. Blue for allowing him to use the facilities 

 of the Tropical Pastures and Soils Laboratory. Special appreciation 

 is also extended to Dr. S. J. Locascio for allowing the author to use 

 the facilities of the Vegetable Nutrition Laboratory. The help and 



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