The goal is to create an IoT device for monitoring the movement of nutrients in the soil profile. Sensors for the analysis of soil properties are placed vertically in the soil profile every 100 mm. The first sensor is 70 mm deep, the second 170 mm, the third 270 mm and the fourth 370 mm deep. The device will make it possible to analyze the rate of seepage of water and nutrients during rain and to analyze the leaching of nutrients into the lower soil profile, where nutrients are no longer available to plants.

The measurement system is built on the basis of a five-electrode sensor of soil properties, which is connected to the ESP processor via the RS485 bus. The measuring system is powered by a photovoltaic panel and the accumulator is charged for device operation. Data is sent via WiFi to the database. The sensors measure temperature, humidity, content of nitrogen, phosphorus and potassium components, soil conductivity, pH, salinity, as a supplement for IoT devices it also sends battery voltage, PV panel voltage, battery capacity and WiFi signal.

Battery voltage	4.20 V
Panel voltage	7.21 V
Battery capacity	100.00 %
Battery temperature	28.06 °C
Photoresistor	4095.00 Ω
RSSI	-57.00 dBm