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United States Department of Agriculture

Agricultural Research Service

Title: Scheduling Effects on Evapotranspiration with Overhead and below Canopy Application

Authors
item Thompson, A - UNIVERSITY OF MISSOURI
item Martin, D - UNIVERSITY OF NEBRASKA
item Norman, J - UNIVERSITY OF WISCONSIN
item Howell, Terry

Submitted to: International Evapotranspiration Irrigation Scheduling Conference
Publication Type: Proceedings
Publication Acceptance Date: June 28, 1996
Publication Date: N/A

Technical Abstract: The method of water application can influence water loss distribution when irrigating a crop canopy. The Cupid-DPE model was used to evaluate water loss during irrigation with a moving lateral system above a corn canopy. Comparisons were made based on total water loss and loss distribution between overhead sprinklers (impact and spray) and below canopy (LEPA device) water application as well as irrigation timing (daytime versus nighttime). Model results indicate that application methods, such as LEPA, which apply irrigation below much of the canopy can potentially reduce water loss compared to overhead sprinkler systems. For daytime irrigation this reduction was up to 18%. This same advantage was also found for nighttime irrigation, although the differences in water loss were reduced. There was essentially no difference in water loss for the day after irrigation, regardless of the application method.

Last Modified: 12/22/2014
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