water isnt all thats needed, solutes mined from soil, by the root system are required by the entire plant.

Water and solute movement in plants:

https://www.ebsco.com/research-starters/anatomy-and-physiolo...

there is a disconnect between the roots and the xylem, its not a throughway, there is a switchover.

Plant Roots and Mineral Nutrition: An Overview of Molecular Basis of Uptake and Regulation, and Strategies to Improve Nutrient Use Efficiency (NUE)

https://link.springer.com/chapter/10.1007/978-981-15-9380-2_...