
Why is HVAC so hard for indoor farms
Operators, owners, and facility designers of indoor farms know that climate management is one of the most...
Newer wearable devices are more than simple step-counters. Some smart watches now monitor the electrical activity of the wearer’s heart with electrodes that sit against the skin. And because many devices can wirelessly share the data that are collected, physicians can monitor and assess their patients’ health from a distance. Similarly, plant-wearable devices could help farmers and gardeners remotely monitor their plants’ health, including leaf water content — the key marker of metabolism and drought stress. Previously, researchers had developed metal electrodes for this purpose, but the electrodes had problems staying attached, which reduced the accuracy of the data. So, Renato Lima and colleagues wanted to identify an electrode design that was reliable for long-term monitoring of plants’ water stress, while also staying put.
The researchers created two types of electrodes: one made of nickel deposited in a narrow, squiggly pattern, and the other cut from partially burnt paper that was coated with a waxy film. When the team affixed both electrodes to detached soybean leaves with clear adhesive tape, the nickel-based electrodes performed better, producing larger signals as the leaves dried out.
Photo created by jcomp - www.freepik.com
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