Gordon Couger writes

There is work being done that will do just that. It is probably possible to
do it right now. The difficult part is the soil moisture sensor.

In the UK, this isn't really a problem. All soils reach field capacity
at some time during the winter (or in jim's case are permanently there).
After that it's merely a matter of monitoring transpiration and knowing
how much deficit you can get away with.

--
Oz
This post is worth absolutely nothing and is probably fallacious.
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