A Laboratory Study on Non-Invasive Soil Water Content Estimation Using Capacitive Based Sensors.

Sensors (Basel) · 2019 · PMC6387153 · PMID 30764525

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a clear trendno p-value reported

A clear trend between capacitive readings and volumetric water content is shown across the samples; however, with a much lower sensitivity to water content beyond 15%.

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an increasing trendno p-value reported

Figure 3 illustrates an increasing trend captured by the Circular sensor for the four samples; however, with different levels of accuracy.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.