Title page for ETD etd-05072009-110114


Type of Document Master's Thesis
Author Hribal, Sean Allen
URN etd-05072009-110114
Title Crop Coefficients for Cotton in Northeastern Louisiana
Degree Master of Science (M.S.)
Department Geography & Anthropology
Advisory Committee
Advisor Name Title
Robert Rohli Committee Chair
Ernest Clawson Committee Co-Chair
Barry Keim Committee Member
David Brown Committee Member
Keywords
  • Cotton
  • Crop Coefficients
  • Evapotranspiration
  • Lysimeters
  • Louisiana
Date of Defense 2009-03-19
Availability unrestricted
Abstract
Daily crop coefficients (Kc) were determined for irrigated cotton (Gossypium hirsutum L.) at the Louisiana State University (LSU) AgCenter Northeast Research Station near St. Joseph, Louisiana, in 2007. Kc values were calculated using daily crop evapotranspiration (ETc), which was measured using paired weighing lysimeters, and daily reference evapotranspiration (ETo), which was calculated using the Standardized Reference Evapotranspiration Equation (SREE) for a short crop. Meteorological data for input into the SREE were obtained from a nearby Louisiana Agriclimatic Information System (LAIS) weather station and an on-site portable weather station. Averaged Kc values were 0.15, 0.64, and 1.39 for the initial (day 22 to 29), development (day 30 to 69), and mid-season (day 70 to 136) stages. The beginning of the mid-season stage corresponded closely with first flower (FF), maximum internode length, and 80 percent crop canopy cover. Also, the relationship between Kc and day after planting was determined for each stage. Kc values from this study can be used to estimate ETc for irrigated cotton in a clay soil in northeastern Louisiana.
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