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Hi: I am not a botanist but I would like to know fast can plants
extract deep soil moisture ( 1 m).

Of course, this depends on solar radiation, temperature, relative
humidity, and wind speed of overlying atmosphere and the kinds of
plants (deep roots or shallow roots?) we are talking about.

I just need to know a rough number, say 1 day, several days, or weeks,
etc for deep root plants (root system 36 in) vs. shallow root plants
(root system about 18 in) .

Could someone point me to a journal, textbook or website?

Thanks a million. --- W