ACKNOWLEDGEMENTS 



The author wishes to express his sincere appreciation to che pro- 

 fessors and staff of the Soil Science Department who have offered so 

 much time, guidance, encouragement, and help during the progress of 

 this investigation. Dr. W. G. Blue, chairman of the supervisory com- 

 mittee, deserves special recognition for his guidance and help in this 

 project. In spite of his many commitments and busy schedule, Dr. Blue 

 always is available to discuss problems which inevitably arise in 

 research and to offer guidance and encouragement. 



Dr. R. D. Rhue and all of the personnel of the Soil Testing and 

 Analytical Research Laboratories where most of the analytical work was 

 conducted deserve special recognition for their help, friendship, 

 cooperation, patience, and tolerance throughout this program. 



The contributions of Dr. T. L. Yuan, Dr. J. B. Sartain, Dr. R. N. 

 Gallaher, and Dr. R. D. Rhue as members of the Supervisory Committee 

 are gratefully acknowledged. 



The author is also indebted to Dr. H. L. Breland, Professor 

 Emeritus, and Dr. C. F. Eno, Chairman of the Soil Science Department, 

 for securing the graduate assistantship through the Extension Soil 

 Testing Laboratory. Their support and encouragement of this project 

 and others are appreciated. 



Special appreciation is extended to Peggy, his wife, for her 

 support, perseverance, and understanding and for the many hours she 



