Introductory Crop Physiology

Differences between Transpiration and Guttation

Transpiration	Evaporation
Transpiration takes lace throughout the day and the rate is maximum at noon.	Guttation takes place at night and in the early morning
It does not depend on root pressure	Depends on root pressure
Water is lost from aerial parts of plants in the form of invisible water vapour	Watery solution oozes out from uninjured margins of aerial leaves.
Transpiration occurs mostly through stomata. It may also take place through cuticle and lenticels	It occurs only through hydathodes (water stomata)
Transpired water is pure	Guttation fluid contains salts and sugars as aqueous solution.
The leaf temperature is reduced	There is no such effect