CONTENTS 



Preface hy T. Wallace, C.B.E., M.C., D.Sc, F.R.I.C. (Agricul- 

 tural and Horticultural Research Station, Bristol University, Long 



Ashton, Bristol) vii 



Foreword hy M. J. Sirks, Ph.D. (Genetisch Instituut der Rijks- 

 universiteit, Haren near Groningen, Netherlands; President Inter- 

 national Union of Biological Sciences) xi 



Table of Contents xiii 



List of Illustrations and Plates xvii 



List of Tables xix 



Opening Address hy the late B. Nemec, D.Phil, (formerly 

 Professor of Plant Physiology, University of Prague) • • 1 



The Application of the Method of Visual Diagnosis to 

 Trace Element Problems in Plants hy T. Wallace, 

 C.B.E., M.C., D.Sc, F.R.I.C. (Agricultural and Horti- 

 cultural Research Station, Bristol University, Long Ash- 

 ton, Bristol) 5 



Introduction 5 



The Visual Method, Its Basis and Use 6 



The Application of the Visual Method to Trace Ele- 

 ment Problems 6 



Deficiencies 7 



Excesses 7 



Relationships of Trace Elements to Other Nu- 

 trients 8 



Soil Acidity Effects 8 



Conclusion 9 



References 9 



Discussion 10 



Large Scale Sand Culture Methods for the Study of Trace 

 Element Nutrition of Plants hy E. J. Hevi^itt, Ph.D., 

 B.Sc. (Agricultural and Horticultural Research Station, 

 Bristol University, Long Ashton, Bristol) 13 



Containers 1^ 



Sand 1^ 



Water Supply 15 



NuTRiEi^ Reagents 15 



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