The root pressure is the hydrostatic pressure produced in the roots. Active transport is used by root cells to carry mineral nutrients into the root. By creating a concentration gradient, this causes water to be pulled to the root by osmosis that creates a pressure.
This hydrostatic pressure produced in the roots, aids in pushing fluids and other ions from the soil upward into the plant's vascular tissue i.e. the xylem. Positive pressure from the roots helps to drive water up into the aboveground plant and out of the roots.
When transpiration is little or absent, root pressure can move water and dissolved mineral nutrients from roots through the xylem to the top of relatively short plants. It happens when there is a high amount of soil moisture, either at night or when there is little transpiration during the day.
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