[Stephen]’s system uses commercially available sensors that track pH levels and Oxidation-Reduction Potential (ORP), both basic measurements that indicate water quality. A second set of sensors ...

including satellite imagery and sensor readings, it becomes possible to detect areas with differing nutrient levels, moisture content, and pH,” Dutt said, adding that by analysing soil samples ...

So a low-power radio network for soil moisture sensors is certainly a welcome development. We can think of a lot of ways that sensors could be powered in the field. Solar comes to mind ...