When is the root pressure highest?

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(B) Root pressure is a positive pressure that develops in the xylem of roots due to the active absorption of mineral ions from the soil.When transpira

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Low transpiration,high water absorption

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(B) Root pressure is a positive pressure that develops in the xylem of roots due to the active absorption of mineral ions from the soil.When transpiration is low (e.g.,at night or early morning) and water absorption is high,the water potential of the root xylem becomes more negative than the soil,leading to an influx of water.This accumulation of water in the xylem creates a positive hydrostatic pressure,known as root pressure,which pushes the xylem sap upwards.Therefore,root pressure is highest when transpiration is low and water absorption is high.

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