Estimating cotton crop water use from multispectral aerial imagery, 2003

G. J. Fitzgerald, D. J. Hunsaker, E. M. Barnes, T. R. Clarke, R. Roth, P. J. Pinter

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

2 Scopus citations

Abstract

Current numerical models used for irrigation scheduling rely on single point measurements to predict irrigation needs for entire fields. To incorporate the spatial dimension, remotely-sensed imagery was investigated as a tool for estimating water use by cotton in central Arizona. This report presents the second year of a study situated in a furrow-irrigated field with large variation in soil texture. Aerial imagery was obtained every two to three weeks using a high resolution camera system equipped with narrow band-pass filters and calibrated with ground-based reference tarps. The normalized difference vegetation index (NDVI) was used to estimate the crop coefficient (K cb) for cotton via a previously defined relationship. The K cb plus estimated soil evaporation coefficients were multiplied by reference evapotranspiration (ET o) determined from a nearby weather station and summed during each irrigation interval to provide a seasonal water use map of the field. The map was validated using soil water balance with periodic soil moisture measurements. Areas of the field with less vigorous canopy were poorly predicted in 2003, although ET in areas with more robust growth was well characterized. Although ET predictions in 2003 were not as accurate as in 2002, the study demonstrated that if relationships between imagery and ET can be developed, maps showing the spatial and temporal dynamics of crop water use can be created. Water use maps can offer insight into spatially-variable crop response and help define and manage zones in surface irrigated fields. Copyright ASCE 2005.

Original languageEnglish (US)
Title of host publicationWorld Water Congress 2005
Subtitle of host publicationImpacts of Global Climate Change - Proceedings of the 2005 World Water and Environmental Resources Congress
Number of pages1
DOIs
StatePublished - Dec 1 2005
Event2005 World Water and Environmental Resources Congress - Anchorage, AK, United States
Duration: May 15 2005May 19 2005

Publication series

NameWorld Water Congress 2005: Impacts of Global Climate Change - Proceedings of the 2005 World Water and Environmental Resources Congress

Other

Other2005 World Water and Environmental Resources Congress
CountryUnited States
CityAnchorage, AK
Period5/15/055/19/05

ASJC Scopus subject areas

  • Water Science and Technology

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    Fitzgerald, G. J., Hunsaker, D. J., Barnes, E. M., Clarke, T. R., Roth, R., & Pinter, P. J. (2005). Estimating cotton crop water use from multispectral aerial imagery, 2003. In World Water Congress 2005: Impacts of Global Climate Change - Proceedings of the 2005 World Water and Environmental Resources Congress (World Water Congress 2005: Impacts of Global Climate Change - Proceedings of the 2005 World Water and Environmental Resources Congress). https://doi.org/10.1061/40792(173)525