TABLE- OF CONTENTS 



Page 



ACKNOWLEDGEMENTS ii 



LIST OF TABLES vii 



LIST OF FIGURES x 



ABSTRACT xii 



SECTION 



INTRODUCTION 



II. REVIEW OF LITERATURE 



2 

 2 

 2 



3 

 3 

 3.2 



3.3 

 3.3 



SOURCES OF SULFUR 



SOIL SOURCES 



1 Sulfur-Containing Minerals 



Soil Organic Matter 



1 C:N:S relationships 



2 Organic sulfur fractionation. . . . 

 Soil Sulfur Reactions 



Oxidation-reduction 



Precipitation reactions 



Adsorption reactions 



1 Factors Affecting Adsorption. . . 

 3.3.2 Mechanisms of Sulfate Adsorption. 



3.4 Leaching 



ATMOSPHERIC SOURCES 



Sulfur as a Pollutant 



1 Damage to plants 



2 Damage to animals . 



Sources of Atmospheric Sulfur . . . . 



1 Anthropogenic sources 



2 Biogenic sources 



3 Local and Regional Studies of Rainfall 



and Atmospheric S 



FERTILIZER SOURCES 



PLANT SULFUR NUTRITION 



THE ROLE OF SULFUR IN PLANT NUTRITION 

 SULFUR UPTAKE BY PLANTS 



, 1 Root Uptake 



,2 Absorption from the Atmosphere. . . 



4 



4 



4 



5 



6 



8 



13 



13 



16 



20 

 on 



22 

 26 



OQ 



28 

 28 

 29 

 29 

 30 

 32 



32 

 36 



39 

 39 



41 

 41 

 42 



IV 



