Soil carbon sensor and sensing arrangement

A soil carbon sensor comprising:

• a probe body configured for operative placement into soil;
• a first detector supported by the probe body and configured to transmit a frequency-modulated signal into the soil, the first detector including a first electrode configured responsive to a moisture content and bulk density of the soil;
• a second detector supported by the probe body and configured to transmit an amplitude-modulated signal into the soil, the second detector including a second electrode configured responsive to a soil organic carbon (SOC) content of the soil;
• and
• a processor arranged in signal communication with the first and second detectors, the processor configured to:
• i. generate and control the transmission of the frequency amplitude-modulated signals;
• ii. monitor the first electrode to capture an impedance measurement indicative of the moisture content and bulk density;
• and
• iii. monitor the second electrode to capture a current measurement indicative of the soil organic carbon (SOC) content;
• wherein such captured impedance and current measurements are useable to calculate a carbon content of the soil.