and moves down along condensing surface 36 while being cooled even further when the temperature of air in cooled flow 64 reaches the dew point condensate starts forming on the condensing surface 36 depending on the wetting properties of condensing surface 36 a film small droplets or larger droplets 84 of liquid water form on the surface acting under the forces of gravity the condensate slides down toward drain hole 53 located at the lowest portion of cavity 31 and passes through drain tube 56 into anti siphon vessel 58 as the air in cooled flow 64 reaches the lowest portion of cooling passage 32 it is heated by mixing radiation from tray 28 and contact with warming fins 54 as a result the air has a tendency to rise toward tray 28 thereby intensifying the warming effect air warmed in this fashion now enters warming passage 30 and moves up along bottom surface 26 of tray 28 while being further warmed and receiving water vapor 49 desorbed from sorption medium 24 thereby completing an entire cycle liquid water condensate received by the anti siphon vessel 58 is then transferred into water delivery assembly 27 and is provided by delivery tip 68 to the soil in the vicinity of plant roots fig1 delivery tip 68 is.