A high-sensitivity multilayer soil moisture monitoring sensor based on a double high-frequency tuning detection circuit

Qinglan, Shi; Yujiao, Shi; Liu, Xiaochen; Mei, Shuli; Feng, Li

doi:10.1177/1550147720907826

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…New low-cost soil moisture sensors have been developed in recent times based on sensing approaches commonly used in commercially available sensors, including frequency domain reflectometry (FDR) (Xiao et al, 2010), time domain reflectometry (TDR) (Wei et al, 2013), impedance spectroscopy (Umar and Setiadi, 2015), and capacitance-based methods (Kojima et al, 2016;Gao et al, 2018). Novel approaches in the measurement of soil moisture content have also been developed in recent times, such as a timedomain multiplexing approach described in Saeed et al (Saeed et al, 2019) and a high frequency double-resonance tuning approach developed by Qinglan et al (Qinglan et al, 2020). Ding and Chandra introduce a Wi-Fi-based measurement system that relies on radio-frequency propagation (Ding and Chandra, 2019).…”

Section: Soil-based Approachesmentioning

confidence: 99%

How much is enough in watering plants? State-of-the-art in irrigation control: Advances, challenges, and opportunities with respect to precision irrigation

Owino

Söffker²

2022

Front. Control Eng.

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With a rapidly expanding global population placing an ever growing demand on freshwater resources, an increased focus on irrigation techniques tailored to the specific needs of plant appears as one solution to minimize overall freshwater consumption. Precision irrigation methods seek to realize an acceptable compromise between yield and irrigation water consumption through control of the timing and quantity of water supplied to plants. The goal is to maintain the water content of the soil, achieve specific water use efficiency with regard to yield or maintain the physiological response of the plant to water stress within predetermined limits. Reliance on soil moisture measurements to establish irrigation water demand inadequately addresses heterogenous distribution of water in soil. Growing research interest is observed detailing the determination of plant water status directly from physiological responses. This paper reviews irrigation control approaches based on different plant water status assessment techniques. A distinct focus is made on application scale of the discussed control approaches, an aspect that has not been considered intensively enough in previous discussions of irrigation control approaches. A discussion of the observed strengths and shortcomings and technological advances supporting the various methods used to quantify plant water status extends the review. Emerging trends that are likely to have an impact on plant water status determination and optimal timing and quantification of irrigation water requirements are integrated to show latest results. A peek into the future of precision irrigation foresees greater reliance on plant-based signals, both in characterization of the control variable, namely the plant water status, and in generation of controller outputs in terms of quantity and timing.

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