Noun
English Wikipedia has an article on:root pressureWikipedia
root pressure (countable and uncountable, plural root pressures)
The pressure (the result of osmosis) exerted by the roots of vascular plants that moves water into the leaves and causes guttation.
For plants less than 50 cm tall, root pressure can be sufficient to redissolve air. Source: Internet
Maples use root pressure each spring to force sap upwards from the roots, squeezing out any air bubbles. Source: Internet
Xylem transport is driven by a combination of transpirational pull from above and root pressure from below, which makes the interpretation of measurements more complicated. Source: Internet