|Gonzalez Dugo, M. - UNIVERSIDAD DE CORDOBA|
|Bryant, R. - UNIVERISTY OF ARIZONA|
Submitted to: Congreso Nacional De Riegos
Publication Type: Proceedings
Publication Acceptance Date: January 31, 2002
Publication Date: January 31, 2002
Citation: Gonzalez Dugo, M.P., Bryant, R., Moran, M.S. 2002. Uso de la variabilidad termica en la determinacion del estres hidrico en cultivos. XVIII Congreso Nacional de Riegos, June 20-24, 2002, Helva Espana. 2002 Unpaginated CD ROM. Interpretive Summary: For efficient crop irrigation, it is necessary to know the water needs of the crop throughout the growing season. Results from studies conducted over the past twenty years have shown that measurements of plant temperature, relative to air temperature, could be used to assess crop water status. This approach, often termed the Crop Water Stress Index (CWSI), has been adopted by several commercial companies for crop irrigation scheduling. In this study, we compared the CWSI with a simpler, temperature-based approach that relies solely on the distribution of crop temperatures and does not require measurements of air temperature and other meteorological data. This alternative approach was termed the Histogram-Derived Crop Water Stress Index (HCWSI). Good agreement was found with CWSI for cotton and alfalfa crops in Central Arizona. With some refinement, this HCWSI could produce useful crop management information with a minimum investment of time and money.