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Water relations in eucalypt seedlings as affected by potassium levels and water stress were studied under controlled conditions. In a first trial, two levels of K (0 and 150 mg L -1 ) and two levels of soil moisture (field capacity and cyclic water stress) were tested on seedlings of eucalypt hybrids grown in plastic bags containing 9 L of a redyellow latossol. The hybrids reacted differently according to K and soil moisture level combinations. In a second trial, the effect of K level of a nutrient solution on water relations of eight eucalypt species was investigated. It was observed that a greater K level (70 mg L -1 ) in the nutrient solution increased the efficiency of water use (EWU) of all eucalypt species, particularly of Eucalyptus camaldulensis and E. citriodora which when supplied with less K (7 mg L -1 ) showed lower EWU and a higher transpiration rate than E. tereticornis, E. grandis and E. pellita.In a third trial, polyethylene glycol (PEG) was added to the nutrient solution in order to obtain three osmotic potentials (that corresponding to the original nutrient solution; -0.25 MPa; -0.50 MPa). The results allowed the placement the eucalypt species into three groups according to the stomatal resistance (r): 1) E. camaldulensis, E.

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