The micro-organisms of the soil
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THE MICRO-ORGANISMS OF THE SOIL
INTRODUCTION.
CONTENTS.
CHAPTER I. THE DEVELOPMENT OF THE IDEA OF A SOIL POPULATION.
A SELECTED BIBLIOGRAPHY.
CHAPTER II. SOIL BACTERIA.
A. Occurrence and Methods of Study.
B. Activities Connected with the Acquirement of Energy.
(1) Decomposition of Non-nitrogenous Compounds.
(2) Ammonia Production.
(3) Nitrate Production.
(4) Anaerobic Respiration.
CHAPTER III. SOIL BACTERIA.
C. Activities Connected with the Building-up of Bacterial Protoplasm.
(1) Composition of Bacteria.
(2) Sources of Carbon.
(3) Assimilation of Nitrogen Compounds.
(4) Fixation of Free Nitrogen.
D. The Relation of Bacterial Activities to Soil Fertility.
E. Changes in Bacterial Numbers and Activities, and their Relation to External Factors.
REFERENCES TO CHAPTERS II. AND III.
CHAPTER IV. PROTOZOA OF THE SOIL, I.
Classification.
Life Histories.
Distribution of Soil Protozoa.
CHAPTER V. PROTOZOA OF THE SOIL, II.
Seasonal Changes.
Soil Reaction.
Protozoa and the Nitrogen Cycle.
SELECTED BIBLIOGRAPHY.
CHAPTER VI. ALGÆ.
I. General and Historical Introduction.
II. The Soil as a Suitable Medium for Algal Growth.
III. Relation of Algæ to the Nitrogen Cycle
IV. Relation of Algæ to Soil Moisture and to the Formation of Humus Substances.
V. Relation of Algæ to Gaseous Interchanges in the Soil.
SELECTED BIBLIOGRAPHY.
I. General.
II. Relation of Algæ to Light and Carbon.
III. Relation of Algæ to Nitrogen.
CHAPTER VII. THE OCCURRENCE OF FUNGI IN THE SOIL.
Qualitative Study.
Quantitative Study.
Conclusion.
CHAPTER VIII. THE LIFE OF FUNGI IN THE SOIL.
Relation of Soil Fungi to Living Plants.
Relation of Fungi to Soil Processes.
Carbon Relationships.
Nitrogen Relationships.
Mineral Relationships.
Control of Soil Fungi.
Relation to Soil Fertility.
CHAPTER IX. THE INVERTEBRATE FAUNA OF THE SOIL (OTHER THAN PROTOZOA).
Method of Investigating the Soil Fauna.
Groups of Invertebrata Represented in the Soil.
Number of Organisms Present and their Distribution in Depth.
Dominance of Certain Species and Groups.
Classification of Soil Invertebrates According to Feeding Habits.
The Influence of Environmental Factors upon The Invertebrates of the Soil.
The Relation of Soil Invertebrates to Agriculture.
LITERATURE REFERRED TO.
CHAPTER X. The Chemical Activities of the Soil Population and their Relation to the Growing Plant.
Material Changes.
AUTHOR INDEX.
SUBJECT INDEX.
Transcriber’s Notes
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