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ECIA2O Probe User's Manual <br />4, Collecting Data <br />Potting soil <br />The following equations can be used to convert EG5 out- <br />put to water content in potting soil. We tested several <br />types of potting soil (Sunshine mix, Miracle Grow Potting <br />Mix, and Custom Nursery soil) at several salinities and <br />found that VWC is given by <br />q = 7.2 * 10-4 * Raw- 0.393 (3) <br />q=10.3*10-4*mV-0.334 (4) <br />for a datalogger with 2500mV excitation. <br />ockwool <br />The EG5 was calibrated in Grodan Master rockwool with <br />solution electrical conductivities of 0.2, 1.0, 1.5, 2.0, and <br />4.5 dS/m Volumetric water content can be calculated <br />using <br />q = 6.28 * 10-7 * Razg + 1.37 x 10-4 * Raw- 0.183 (5) <br />for a Decagon datalogger or <br />q = 2.63 :E 10"6 ', mV2 + 5.07 x 10-4 >* mV - 0.0394 (6) <br />for a datalogger with 2500 mV excitation. <br />NOTE: These calibration constants only apply to <br />2500V excitations; use of these numbers with any <br />other excitation voltage will result in erroneous read- <br />ings! <br />19 <br />