The nitrate and potassium sensor is able to work in any type of soil. The interpretation of the data provided by the probe is similar to the interpretation of soil humidity probes, whose working principle is by capacitance: we generate a history per soil and learn from the experience with the upper and lower levels. The probe shows the nitrate tendency at root level. In this way, we can learn if the plant takes the nitrates supplied through the watering or if it even accumulates them.