Tuesday, November 6, 2007
139-6

Using Remote Sensing and Crop Models to Compare Water Use of Cotton Under Different Irrigation Systems.

Nithya Rajan, Texas Tech University, 4302 16th Street Apt 11, Lubbock, TX 79416 and Stephan Maas, USDA-ARS, Texas Tech University, 3810 4th St., Lubbock, TX 79415.

In the Texas High Plains, cotton is grown under several different irrigation systems, including center pivot, sub-surface drip, furrow and dryland. In this study, remote sensing and crop modeling were used to estimate the crop water use (CWU) of cotton grown under these irrigation systems. Remote sensing allowed the site-specific determination of a crop coefficient used in estimating CWU from potential evapotranspiration. A crop model was used to simulate the CWU of a field on each day of the growing season based on infrequent remote sensing observations. Estimates of CWU for the various irrigation systems made using this approach were compared to actual observations obtained from eddy covariance measurements.

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