Irrigation Water Requirement. Evapotranspiration. Terminology Evaporation Process of water movement, in the vapor form, into the atmosphere from soil, water, or plant surfaces Transpiration Evaporation of water from plant stomata into the atmosphere Evapotranspiration
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Daily Water Use:peaks late in afternoon; very little water use at night
Alfalfa: Ft. Cobb, OK
June 26, 1986
Corn Water Use Pattern
Irrigation system must be able to meet peak water use rate or the crop may be lost.
ETc = Kc ETo
(catch cans placed on a 5 ft x 5 ft grid)