Watering technique is the same for all plants, no matter if it is a houseplant or an old tree.
How Much: Fill up the root zone of the plant with water and stop when water goes beyond roots.
How Often: Repeat after the roots have had adequate gas exchange for good growth. This maybe after a couple of days or a couple of weeks depending on the environment.
ET (Evaporation and Transpiration) loss during the day is recorded at weather stations. For Manhattan go to: Weather Data Library and enter the weather station id as Manhattan.
Watering Publication Series
Low Water Use Plants For Kansas Landscapes
Maintaining Good Lawns with Less Water