Surface energy balance and surface coefficients of a corn field during non-growing periods

Christopher H. Hay, Suat Irmak

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Efficient use of water in agroecosystems requires accurate quantification of evapotranspiration (ET) during growing and non-growing (dormant) periods. Prediction of ET during the growing season has been well researched, but relatively little information exists on evaporative losses during non-growing periods. The objective of this research was to evaluate ET in relation to available energy, precipitation, and reference ET for a corn field during the non-growing period (October 15 through April 30). Three consecutive non-growing periods were studied: 2004-2005 (season I), 2005-2006 (season II), and 2006-2007 (season III). Bowen ratio energy balance system-measured ET was approximately 50% of available energy during average and wet seasons (seasons I and III) and 41% of available energy during a dry season (season II). Cumulative ET ranged from 133 to 167 mm and exceeded precipitation by 21% during the dry season. Mean surface (crop) coefficients were 0.63 and 0.48 for grass and alfalfa-reference crops, respectively. Regression equations were developed that yielded reasonable estimates of ET for the average and wet seasons. Considering non-growing period evaporative losses in water budget calculations would enable water regulatory agencies to better account for water use over the entire year rather than only for the growing season.

Original languageEnglish (US)
Title of host publicationWorld Environmental and Water Resources Congress 2008
Subtitle of host publicationAhupua'a - Proceedings of the World Environmental and Water Resources Congress 2008
DOIs
StatePublished - 2008
EventWorld Environmental and Water Resources Congress 2008: Ahupua'a - Honolulu, HI, United States
Duration: May 12 2008May 16 2008

Publication series

NameWorld Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008
Volume316

Other

OtherWorld Environmental and Water Resources Congress 2008: Ahupua'a
Country/TerritoryUnited States
CityHonolulu, HI
Period5/12/085/16/08

All Science Journal Classification (ASJC) codes

  • Management, Monitoring, Policy and Law
  • Water Science and Technology
  • Pollution

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