Photosynthesis Related Instrumentation.- Radiation Measurement.- A Portable Photosynthesis System.- Instrumentation for the Measurement of CO2 Assimilation by Crop Leaves.- Non-Invasive Measurements of Photosystem II Reactions in the Field Using Flash Fluorescence.- Fluorescence and Absorbance Measurements in Leaves: Sensors of Photosynthetic Performance.- Environmental Instrumentation.- Humicap (R) Thin Film Humidity Sensor.- The Neutron Probe for Soil Moisture Measurement.- Thermocouple Psychrometers for Water Potential Measurements.- Radiation Thermometry in Agriculture.- Theoretical Framework.- Instrumentation Use in a Comprehensive Description of Plant-Environment Interactions.- Growth and Nutrient Status.- Crop Essential Element Status Assessment in the Field.- The Development of Electrochemical Sensors.- Presentation and Implications of an Experimental Growth System.- Ion Transport Processes in Corn Roots: An Approach Utilizing Microelectrode Techniques.- Water Status Instrumentation.- Water and Plants.- Stem Diameter and Electrochemical Measurements.