Tenth International Course on Land Drainage- Notes on Chapter 1.3.2 1971

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1971
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Irrigation and Drainage Research
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Plants need to draw quantities of water from the soil far in excess of their actual metabolic requirements. Transpiration, i.e. the loss of water vapour by plants is not a necessary result of the living processes of the plants themselves, because they can thrive in a (nearly) saturated atmosphere without hardly transpiring at all. Transpiration is caused by the vapour pressure gradient existing between the leaves and the atmosphere.
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