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Rhuanito Soranz Ferrarezi, Marc W. van Iersel, and Roberto Testezlaf

set values and thereby minimize water use and reduce nutrient leaching ( Bayer et al., 2013 ; Nemali and van Iersel, 2006 ). Sensor-based automation could also allow growers to have better control over subirrigation. Soil moisture sensors allow real

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Scott Henderson, David Gholami, and Youbin Zheng

. This kind of system initiates irrigation at a user-identified substrate VWC(s) ( Belayneh et al., 2013 ; Chappell et al., 2013 ). Soil moisture sensor-based systems are promising; however, there is not enough information on how many sensors are

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Julián Miralles-Crespo and Marc W. van Iersel

closing solenoid valves as needed. The limitation of this system is that a basic knowledge of programming and wiring dataloggers is required. However, there are commercially available irrigation systems that not only include soil moisture sensors, but also

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Amanda Bayer, Imran Mahbub, Matthew Chappell, John Ruter, and Marc W. van Iersel

more sophisticated soil moisture sensor-based irrigation systems that can irrigate based on plant water use, has the potential to reduce the amount of water needed for irrigation and the amount of runoff produced during and immediately after an

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Colin S. Campbell, Gaylon S. Campbell, Douglas R. Cobos, and Brody Teare

Knowledge of soil water, fertilizer, and temperature is important when growing plants in any type of growing media. Although instruments to measure these properties have been available for several years, they are often expensive, failure-prone, and require different calibration for individual soil types. Recently, a low-cost sensor (Trade name: ECH2O-TE) was released that measures volumetric water content, electrical conductivity (EC), and temperature. The objective of this study was to determine how the probe performed in various soil and soilless media, as well as various salinities. We found the probe performed very well over a wide range of soil types and salinities. From the data, it appears that a single calibration can be used for all mineral soils and organic potting soils. A second calibration equation may be required for substrates such as rockwool. The output of the probe was not affected by the salinity (EC) of the soil from 0.1 to greater than 10 dS/m and showed considerable improvement in temperature sensitivity compared to existing technology. These results suggest the sensor provides a low-cost, reliable, easier-to-use alternative to other sensors of its kind.

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George Kargas, Nikolaos Ntoulas, and Panayiotis A. Nektarios

relatively new and inexpensive frequency domain dielectric soil moisture sensor. The probe consists of three metal rods of 6.8 cm long and 3 mm diameter that are spaced 1.5 cm apart. The whole central rod is covered by a coating material except for the tip

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Taryn L. Bauerle, William L. Bauerle, Marc Goebel, and David M. Barnard

soil moisture sensor variability. We hypothesized that high variability in fine root density will result in high sensor variability. Additionally, we predicted that species with a high proportion of course roots would result in high sensor variability

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Bandara Gajanayake, K. Raja Reddy, Mark W. Shankle, and Ramon A. Arancibia

treatment levels were monitored and maintained based on the volumetric water content determined by moisture sensors (Model EC-5; Decagon Devices, Inc., Pullman WA) inserted at a depth of 10 cm in every five random pots of each soil moisture treatment. All

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Yong Ha Rhie and Jongyun Kim

improve efficiency in water and nutrient use in horticultural plant production ( Lea-Cox et al., 2013 ). Among available sensor technologies, soil moisture sensors can provide growers with valuable information on substrate moisture conditions in real time

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Rhuanito Soranz Ferrarezi, Sue K. Dove, and Marc W. van Iersel

capacitance soil moisture sensors require less maintenance and provide data that are easier to interpret than tensiometers, VWC may be the most useful measurement for automating irrigation systems ( Nemali et al., 2007 ). Capacitance sensors allow for easy