Estimating Soil Moisture Under Low Frequency Surface Irrigation Using Crop Water Stress Index
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Volume 129, Issue 1
Abstract
The present study investigated the relationship between the crop water stress index (CWSI) and soil moisture for surface irrigated cotton (Gossypium hirsutum, Delta Pine 90b) at Maricopa, Arizona during the 1998 season. The CWSI was linked to soil moisture through the water stress coefficient that accounts for reduced crop evapotranspiration when there is a shortage of soil water. A stress recovery coefficient was introduced to account for reduced crop evapotranspiration as the crop recovered from water stress after irrigation events. A soil water stress index (SWSI) was derived in terms of and The SWSI compared reasonably well to the CWSI, but atmospheric stability correction for the CWSI did not improve comparisons. When the CWSI was substituted into the SWSI formulation, it gave good prediction of soil moisture depletion (fDEP; when to irrigate) and depth of root zone depletion how much to irrigate). Disagreement was greatest for because cotton is less sensitive to water stress in this range.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 129 • Issue 1 • February 2003
Pages: 27 - 35
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Apr 12, 2001
Accepted: May 16, 2002
Published online: Jan 15, 2003
Published in print: Feb 2003
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