Table of Contents
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WP
PotentiaMeter
4C
Table of Contents
Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Verification Standards . . . . . . . . . . . . . . . . . . . . . . . . . . 21
When to Verify Calibration . . . . . . . . . . . . . . . . . . . . 22
How to Verify and Calibrate the WP4C . . . . . . . 22
6. Sample Preparation . . . . . . . . . . 25
Choosing a Sample Cup . . . . . . . . . . . . . . . . . . . . . . . . . 25
Preparing the Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Dry Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Samples and Temperature . . . . . . . . . . . . . . . . . . . . . . 27
Measuring Plant Samples . . . . . . . . . . . . . . . . . . . . . . . 29
7. Taking a Reading . . . . . . . . . . . . 30
How WP4C takes Readings . . . . . . . . . . . . . . . . . . . . 31
Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8. Computer Interface . . . . . . . . . . . 33
9. Theory: Water Potential . . . . . . 35
Water Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Measuring Water Potential . . . . . . . . . . . . . . . . . . . . . 35
Effect of Temperature on Water Potential . . . . . 37
Estimating Osmotic Potential . . . . . . . . . . . . . . . . . . . 38
10. Cleaning and Maintenance . . . 39
Tools Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Accessing the Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Cleaning Procedure: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Checking Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
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