Temperature Calibration of Capacitance Probes to Measure Soilless Substrate Water
Dielectric sensors have been widely used for nondestructive determination of volumetric water content. Previous work has shown that temperature can affect these sensors, but relatively little has been done to correct these effects. This study evaluated a new probe (ECH2O EC-5 sensor) in terms of changing soilless substrate actual water content and temperature. To demonstrate the importance of temperature calibration, a calibration equation combing the temperature, the output of probe and the slope values of linear response to temperature depended on apparent water content was developed and analyzed the effect of increasing substrate temperature on the output of probe. We found that the EC-5 probe output increased when temperature was increased at fixed water content. Measurements in four soilless substrates demonstrated that the accurate of ECH2O EC-5 probes increase to 50％ at least after calibration. The sensor can be useful for accurate measurements of soilless substrate water content.
ECH2O-5 probe Soilless substrate Temperature Water content
LIU Zhi-gang L I Ping-ping HU Yong-guang ZHANG Xi-liang
Key Laboratory of Modem Agricultural Equipment and Technology, Ministry of Education & Jiangsu Provi Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education & Jiangsu Prov
国际会议
山东淄博
英文
263-265
2011-05-27（万方平台首次上网日期，不代表论文的发表时间）