The Soil-Root Interface

Participants

Foreword

Acknowledgments

Note on Terminology: Origin, Nature and Nomenclature of the Organic Materials in the Rhizosphere

I. Nutrient Demand and Supply at the Soil Root Interface

Growth Requirements for Nutrients in Relation to Demand at the Root Surface

Properties of Roots which Influence Rates of Absorption

Soil Properties Controlling the Supply of Nutrients to Root Surfaces

Limitations to Current Models Describing Water Uptake by Plant Root Systems

An Electron Paramagnetic Resonance Study of the Uptake of Mn (II) and Cu (II) by Wheat Roots

II. Physics and Chemistry of the Interfacial Region

The Physics and Chemistry of the Soil-Root Interface: Some Comments

Water Potential Gradients and Resistances of a Soil-Root System Measured with Root and Soil Psychrometer

The Effect of Organic Root Products on the Availability of Phosphorus to Plants

Modifications to Mechanical and Mineralogical Composition of Soil within the Rhizosphere

Overestimate of N2-Fixation in the Rhizosphere by the Acetylene Reduction Method

III. Biological Activities at the Interface

Biology of the Soil-Root Interface

Root Microorganisms in Mixtures and Monocultures of Grassland Plants

Response on Non Leguminous Plants to Root Inoculation with Free Living Diazotrophic Bacteria

Estimating Carbon Transfers in the Plant Rhizosphere

Ecophysiology of Vesicular-Arbuscular Mycorrhiza in the Tropics

Effects of Soil Moisture on V/A Mycorrhiza Formation and Root Development in Medicago

The Influence of Amoebae on the Uptake of Nitrogen by Plants in Gnotobiotic Soil

Phosphatase Activity and Phosphorus Availability in the Rhizosphere of Corn Roots

Influence of Tillage and Residues on Wheat Root Microflora and Root Colonization by Nitrogen-Fixing Bacteria

The Root-Soil Interface and Its Significance for Fruit Tree Roots of Different Ages

A Photographic View of Microscopic Processes at the Root-Soil Interface

IV. The Interface in Relation to Environmental Stress and Disease

The Hydraulic Resistance of the Soil-Root Interface - A Cause of Water Stress in Plants

Corn and Cotton Root Growth in Response to Osmotic Potential and Oxygen and Nitrate Concentrations in Nutrient Solutions

The Soil-Root Interface in Relation to Disease

Effect of Physical Factors, Host Resistance and Fungicides on Root Infection at the Soil-Root Interface

Wheat Rhizosphere pH and the Biological Control of Take-All

Systemic Activity of Oxamyl to Meloidogyne Javanica at the Root Surface of Tomato Plants

V. The Interface in Relation to Soil Function and Growth

The Interface in Relation to Root Function and Growth

Measurement of Rooting Patterns for Determinate and Indeterminate Soybean Genotypes with a Fiber-Optic Scope

Calculation of the Root Density Required for Growth in Soils of Different Status

Localized Stimulation of Root Growth and Phosphate Uptake in Zea Mays L. Resulting from Restricted Phosphate Supply

Fine Regulation of Iron Uptake by the Fe-Efficient plant Helianthus annuus

VI. Abstracts of Papers Not Read in Full

1. Effect of NO3- Concentration in Solution on Rate of Uptake by Lolium Perenne

2. Soil Water Stress and Air Humidity Effects on the Root System of Sorghum

3. Effects of Calcium, Phosphorus and Potassium on Mycorrhizal Plants

4. The Role of Abscisic Acid in the Metabolism of Plant Roots

5. Effect of Irrigation Frequency, and Water Salinity and Quantity on Root Water Uptake Distribution and Leaf Water Potentials of Alfalfa

6. A Kinetic Model for the Net Flux of Different Nitrogen Forms into Growing Tomato Plants

7. Nematodes and Microflora in the Root Rhizosphere of Four Desert Shrubs

8. Adaptive Responses of Plant Root Systems to Nutrient Stress

9. Phosphate Content in Rhizocylinder and Bulk Soil Respectively as Indicated by Soil Test Extraction Methods

10. Water Relations of Wheat Alternated Between Two Root Temperatures

11. Simulation of Soil-Root Interactions

12. Some Factors which Influence the Accumulation and Action of Microbial Metabolites around Seeds and Roots

13. The Importance of Rooting in the Nutrition of Crops

14. Role of Rhizosphere in Utilization of Inorganic Iron-III-Compounds by Corn Plants

15. Is the Efficiency of Nutrient Uptake Genetically Controlled?

16. Combined Effect of Linear and Non-Linear Transport Rates on Solute Uptake into Biological Tissues

17. Some Effects of Soil Water Conditions on the Root Growth of Grass in the Peat Muck Soil

18. Mass Flow Transport towards the Root Systems of Two Forest Ecosystems in Relation to the Uptake by the above Ground Tree Parts

19. Dynamics of Water Conductance in Sorghum Roots

20. The Effect of Inoculum Density on the Development of Vesicular-Arbuscular Mycorrhizas of Crop Plants

21. Input and Turnover of Organic Water in Roots and Rhizosphere

22. Use of the Fluorescent Antibody Technique to Identify N2-Fixing Bacteria at the Root Interface in Tropical Grasses

23. Influence of Short-Term Oxygen Stress upon the Translocation of Zinc in Navy Beans (Phaseolus vulgaris L.)

24. Denitrification as Related to Potassium Nutrition of Rye Grass and Moisture Content of Soil

25. Effect of Dry Soil Conditions around the Base of Lolium perenne Plants

26. The Influence of Natural Organic Complexing Agents on the Uptake of Heavy Metals by Plants

27. Simulation of Changes in Nutrient Concentrations in the Root Environment. I. Long Term Models Based on Experiments with Gravel Culture

28. Simulation of Changes in Nutrient Concentrations in the Root Environment. II. Models of Short Term Changes around the Roots

29. Roots Exudates and Microbial Growth in the Interface

30. Microbial Colonization of Roots of Wheat Seedlings

31. Soil Organic Water and Root Surface Enzymes in Winter Wheat

32. Cation Accumulation by Glycine max (L.) Merr. as Related to Maturity Stages

33. Depletion of Potassium Close to Root Surfaces and its Implications for Soil-Grown Plants

34. Ultrastructure of the Rhizoplane of Selected Marine and Freshwater Vascular Macrophytes

Subject Index