In order to investigate the level of humidity of a soil for irrigation purposes, I'd like to learn more on different types of technology that could define soil's level of humidity as a criteria to determine whether or not a land needs to be watered.
3 Types of Soil Moisture Sensors - Which is Best For You?
https://www.google.com/amp/s/mytrellis.com/blog/smstypes%3fformat=amp
I think Tensiometer is the best as soil moisture sensor as it measures the tension between soil particles and water molecules. You may also opt for Opto-electronic humidity sensor. For more details please go through the attached paper.
TDR reflectometer, and infrared sensors are used to determine soil moisture.
If you want soil humidity then read
.. https://www.environmentalbiophysics.org/a-history-of-thermocouple-psychrometry/
If you want an assessment of water content for irrigation scheduling purposes
I'd say that the neutron meter is still the best tool.
There is hand held tensiometer is available to measure the moisture in the soil
It is the soil moisture not soil humidity that can be measured by tensiometer and other soil moisture measuring devices
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