Seasonal changes in (A) assimilation rate (<i>A</i>), (B) stomatal conductance (<i>g_s</i>), (C) intercellular CO₂ concentration (<i>C_i</i>) (D) transpiration rate (<i>E</i>) and (E) atmospheric vapour pressure deficit (VPD) (mean ± SE) in winter wheat under four treatments (CK, DS, DW and IW), during growth stages.

<p>Significant differences (<i>P</i><0.05) are indicated with different lower case letters.