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Tracy A. Boyer, D. Harshanee W. Jayasekera, and Justin Q. Moss

reducing water use ( White and Fane, 2007 ). Other technological studies in horticulture dealt with understanding the potential for conservation among different technological fixes such as rain sensors, SMS, and SIC ( Grabow et al., 2013 ). In sum

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Nastaran Basiri Jahromi, Forbes Walker, Amy Fulcher, James Altland, and Wesley C. Wright

initiating the automatic sensor-based irrigation program. One week after transplanting, plants were top-dressed with 18N–2.6P–9.9K controlled release fertilizer with micronutrients (Osmocote Classic; Everris, Marysville, OH) at 24 g per container, which

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

°28′ N, long. 88°47′ W), Mississippi. The temperatures in the greenhouse were maintained between 24 and 33 °C during the experimental period, May to June 2012. The photosynthetically active radiation measured with a line quantum sensor (LI-191 Line

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Nastaran Basiri Jahromi, Amy Fulcher, Forbes Walker, James Altland, Wesley Wright, and Neal Eash

; Welsh and Zajicek, 1993 ); and/or an increase in leachate volume, which can cause an increase in nutrient losses. Improving irrigation efficiency can be achieved by scheduling irrigation with the appropriate use of sensors rather than by relying on

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Rhuanito Soranz Ferrarezi, Thomas C. Geiger, Jayar Greenidge, Shamali Dennery, Stuart A. Weiss, and Gustavo H.S. Vieira

monitored to evaluate potential differences under the driplines using 36 capacitance sensors (24 10HS and 12 GS3; Decagon Devices, Pullman, WA) installed at a depth of ≈20 cm in the soil. The monitoring system was built using a data logger (CR1000; Campbell

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C. Campillo, M.H. Prieto, C. Daza, M.J. Moñino, and M.I. García

regions, each with its own characteristic properties. Appropriate procedures and sensors must be chosen according to the specific objectives of the radiation measurements ( Jones et al., 2003 ). Visible radiation, between the wavelengths of 400 and 700 nm

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Said A. Hamido, Kelly T. Morgan, Robert C. Ebel, and Davie M. Kadyampakeni

(Decagon Devices, Pullman, WA) at incremental soil depths of 0–15, 15–30, and 30–45 cm. Soil moisture was measured using EC-5 soil moisture sensors at 0–15- and 15–30-cm depths and an HS-10 sensor at the 30–45-cm depth (Decagon Devices). Total available

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Katherine F. Garland, Stephanie E. Burnett, Michael E. Day, and Marc W. van Iersel

occur in plants exposed to high light or, conversely, plants growing in low light may experience periods of excessive water supply ( Burnett and van Iersel, 2012 ). Capacitance sensor automated irrigation systems ( Nemali and van Iersel, 2006 ), which

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Julián Miralles, Raquel Valdes, Juan J. Martínez-Sánchez, and Sebastián Bañón

registered data of substrate temperature with two temperature probes (Termistor 107; Campbell Scientific, Ltd.) per treatment and volume water content (θ) with five EC-5 soil moisture sensors (Decagon Devices, Ltd., Pullman, WA) per treatment. The EC-5 probes

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Jeffery C. Kallestad, Theodore W. Sammis, John G. Mexal, and John White

Optimal pecan (Carya illinoiensis) production in the southwestern United States requires 1.9 to 2.5 m of irrigation per year depending on soil type. For many growers, scheduling flood irrigation is an inexact science. However, with more growers using computers in their businesses, and with soil moisture sensors and computerized data-collection devices becoming more inexpensive and accessible, there is potential to improve irrigation and water use efficiencies. In this project two low-cost soil monitoring instruments were introduced to a group of pecan producers. They were also given instruction on the use of Internet-based irrigation scheduling resources, and assistance in utilizing all of these tools to improve their irrigation scheduling and possibly yield. The objectives were to determine whether the technology would be adopted by the growers and to assess the performance of the sensors at the end of the season. Three out of the five growers in the project indicated they used either the granular matrix (GM) sensors or tensiometer to schedule irrigations, but compared to the climate-based irrigation scheduling model, all growers tended to irrigate later than the model's recommendation. Graphical analysis of time-series soil moisture content measured with the GM sensors showed a decrease in the rate of soil moisture extraction coincident with the model's recommended irrigation dates. These inflection points indicated the depletion of readily available soil moisture in the root zone. The findings support the accuracy of the climate-based model, and suggest that the model may be used to calibrate the sensors. Four of the five growers expressed interest in continued use of the tensiometer, but only one expressed a desire to use the GM sensor in the future. None of the participants expressed interest in using the climate-based irrigation scheduling model.