제목 | 노지 과수원 토성별 수분보유 특성 및 FDR 센서 보정계수 비교 |
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내용 |
As research on a controlled environment system based on crop growth environment sensing for sustainable
production of horticultural crops and its industrial use has been important, research on how to properly utilize soil
moisture sensors for outdoor cultivation is being actively conducted. This experiment was conducted to suggest the
proper method of utilizing the TEROS 12, an FDR (frequency domain reflectometry) sensor, which is frequently used
in industry and research fields, for each orchard soil in three regions in Korea. We collected soils from each orchard
where fruit trees were grown, investigated the soil characteristics and soil water retention curve, and compared
TEROS 12 sensor calibration equations to correlate the sensor output to the corresponding soil volumetric water
content through linear and cubic regressions for each soil sample. The estimated value from the calibration equation
provided by the manufacturer was also compared. The soil collected from all three orchards showed different soil
characteristics and volumetric water content values by each soil water retention level across the soil samples. In
addition, the cubic calibration equation for TEROS 12 sensor showed the highest coefficient of determination higher
than 0.95, and the lowest RMSE for all soil samples. When estimating volumetric water contents from TEROS 12
sensor output using the calibration equation provided by the manufacturer, their calculated volumetric water contents
were lower than the actual volumetric water contents, with the difference up to 0.09-0.17 m3
·m-3 depending on the
soil samples, indicating an appropriate calibration for each soil should be preceded before FDR sensor utilization.
Also, there was a difference in the range of soil volumetric water content corresponding to the soil water retention
levels across the soil samples, suggesting that the soil water retention information should be required to properly
interpret the volumetric water content value of the soil. Moreover, soil with a high content of sand had a relatively
narrow range of volumetric water contents for irrigation, thus reducing the accuracy of an FDR sensor measurement.
In conclusion, analyzing soil water retention characteristics of the target soil and the soil-specific calibration would be
necessary to properly quantify the soil water status and determine their adequate irrigation point using an FDR sensor.
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첨부 |
2022 Lee et al..pdf
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