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Updated: Mar 6, 2026

Relating Stomatal Conductance to Leaf Functional Traits
Published on: October 12, 2015
Is stomatal conductance in a tomato crop controlled by soil or atmosphere?
1Instituto Superior de Agronomia, Universidade Técnica de Lisboa, Tapada da Ajuda, 1399, Lisboa, Portugal.
Abstract:
The effects of soil water deficits and air vapour pressure deficits on stomatal conductance of tomato leaves were analysed separately under field conditions in central Portugal. Three conditions were created: low soil and air humidity (A), high soil and air humidity (B) and low soil but high air humidity (C). The results show that the effect of air vapour pressure deficit on stomatal behaviour is more important than the effect of soil water deficit when the predawn leaf water potential is above -0.4 MPa.
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