title: Is stomatal conductance in a tomato crop controlled by soil or atmosphere?
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.
authors.affiliation: Instituto Superior de Agronomia, Universidade Técnica de Lisboa, Tapada da Ajuda, 1399, Lisboa, Portugal.
authors.forename: M I
authors.initials: MI
authors.lastname: Ferreira
authors.affiliation: Station de Bioclimatologie, INRA, 78850, Thiverval-Grignon, France.
authors.forename: N
authors.initials: N
authors.lastname: Katerji
keywords: Air vapour pressure deficit; Lycopersicum esculentum Mill.; Soil water deficit; Stomatal conductance