Monitoring a shallow soil layer has two main advantages: high root density
and response in real time. It is well known that there is a high density of fine
roots developing at a close proximity to the dripper. Positioning the
tensiometer at this position further enhance active root development for
monitoring, rather than relying on a sparse root system in deeper soil layers
that require measuring several locations for averaging.
The response time in a shallow position is shorter, enabling response in real
time. It takes longer for the water to reach the tensiometer in deeper soil
layers, extending the response time and making it difficult to maintain the
desired threshold tension.