Which one of the following statements is wrong?

Water potential is the difference in the free energy or chemical potential per unit molal volume of water in a system and that of pure water at the same temperature and pressure. It is represented by greek letter $Ψ$ (psi) or more accurately ${Ψ}_{w}$

Water potential or ${Ψ}_{w}$ is the sum total of ${Ψ}_{s}and{Ψ}_{p}$.

${Ψ}_{w} = {Ψ}_{s} + {Ψ}_{p}$

where ${Ψ}_{s} \to$ solute potential

${Ψ}_{p} \to$ pressure potential