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The extrusion of water and sometimes salts from the aerial parts of plants, particularly at night when transpiration rates are low. Guttation may occur in plants that are less than about 10m tall, where hydrostatic pressure is insufficient to prevent the flow of water into the xylem when the rate of transpiration is low. It also occurs in tropical plants, where high humidity inhibits transpiration.

Subjects: Plant Sciences and Forestry — Ecology and Conservation.

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