At ZP we appreciate that there are many types of horticulture including hydro-culture and the subset hydroponics, which are methods of growing plants, usually crops, without soil, by using mineral nutrient solutions in an aqueous solution. The roots may be physically supported by an inert medium such gravel, or other substrates.
At ZP we are asked whether our soil nitrate sensors operate in water and when submerged under water, and whether they can be used as part of a hydroponics system, the quick answer is 'yes'.
As part of the development of the ZP nitrate module and the ZP nitrate rod all the ZP AgTech nitrate sensors were originally developed by testing them in water and it was only after testing in water did we go on to test in soil.
The ZP sensor module have all been tested by submerging them underwater, our motivation was to ensure that they can withstand months of being in the soil, but this also means the sensors can be operate when submerged.