Soil

05.09.2025 04:19:56

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 0.00 V
Battery capacity 100.00 %
Battery temperature 13.88 °C
Photoresistor 43.00 Ω
RSSI -61.00 dBm
Soil

70 mm

Temperature 19.70 °C
Moisture 28.40 %
Nko 32.00 mg/kg
Pko 121.20 mg/kg
Kko 114.20 mg/kg
Vodivost 341.20 mS/m
pH 7.70
Salinity 187.20 mS/m
TDS 170.20

170 mm

Temperature 20.20 °C
Moisture 25.30 %
Nko 20.20 mg/kg
Pko 93.40 mg/kg
Kko 86.20 mg/kg
Vodivost 283.60 mS/m
pH 7.80
Salinity 155.40 mS/m
TDS 141.40

270 mm

Temperature 19.84 °C
Moisture 17.88 %
Nko 13.00 mg/kg
Pko 77.00 mg/kg
Kko 69.40 mg/kg
Vodivost 249.40 mS/m
pH 7.85
Salinity 136.40 mS/m
TDS 124.40

370 mm

Temperature 19.30 °C
Moisture 22.74 %
Nko 17.60 mg/kg
Pko 87.20 mg/kg
Kko 80.20 mg/kg
Vodivost 270.80 mS/m
pH 7.77
Salinity 148.60 mS/m
TDS 135.00