Estimating soil moisture under low frequency surface irrigation using crop water stress index

Paul D. Colaizzi; Edward M. Barnes; Thomas R. Clarke; Christopher Y. Choi; Peter M. Waller

doi:10.1061/(ASCE)0733-9437(2003)129:1(27)

Estimating soil moisture under low frequency surface irrigation using crop water stress index

Paul D. Colaizzi, Edward M. Barnes, Thomas R. Clarke, Christopher Y. Choi, Peter M. Waller

Biosystems Engineering, Research

Research output: Contribution to journal › Article › peer-review

80 Scopus citations

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 K_s that accounts for reduced crop evapotranspiration when there is a shortage of soil water. A stress recovery coefficient K_rec 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 K_s and K_rec. 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 (D_r; how much to irrigate). Disagreement was greatest for fDEP<0.6 because cotton is less sensitive to water stress in this range.

Original language	English (US)
Pages (from-to)	27-35
Number of pages	9
Journal	Journal of Irrigation and Drainage Engineering
Volume	129
Issue number	1
DOIs	https://doi.org/10.1061/(ASCE)0733-9437(2003)129:1(27)
State	Published - Jan 2003

Keywords

Soil moisture
Surface irrigation

ASJC Scopus subject areas

Civil and Structural Engineering
Water Science and Technology
Agricultural and Biological Sciences (miscellaneous)

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10.1061/(ASCE)0733-9437(2003)129:1(27)

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title = "Estimating soil moisture under low frequency surface irrigation using crop water stress index",

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 Ks that accounts for reduced crop evapotranspiration when there is a shortage of soil water. A stress recovery coefficient Krec 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 Ks and Krec. 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 (Dr; how much to irrigate). Disagreement was greatest for fDEP<0.6 because cotton is less sensitive to water stress in this range.",

keywords = "Soil moisture, Surface irrigation",

author = "Colaizzi, {Paul D.} and Barnes, {Edward M.} and Clarke, {Thomas R.} and Choi, {Christopher Y.} and Waller, {Peter M.}",

year = "2003",

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doi = "10.1061/(ASCE)0733-9437(2003)129:1(27)",

language = "English (US)",

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AU - Colaizzi, Paul D.

AU - Barnes, Edward M.

AU - Clarke, Thomas R.

AU - Choi, Christopher Y.

AU - Waller, Peter M.

PY - 2003/1

Y1 - 2003/1

N2 - 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 Ks that accounts for reduced crop evapotranspiration when there is a shortage of soil water. A stress recovery coefficient Krec 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 Ks and Krec. 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 (Dr; how much to irrigate). Disagreement was greatest for fDEP<0.6 because cotton is less sensitive to water stress in this range.

AB - 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 Ks that accounts for reduced crop evapotranspiration when there is a shortage of soil water. A stress recovery coefficient Krec 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 Ks and Krec. 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 (Dr; how much to irrigate). Disagreement was greatest for fDEP<0.6 because cotton is less sensitive to water stress in this range.

KW - Soil moisture

KW - Surface irrigation

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Estimating soil moisture under low frequency surface irrigation using crop water stress index

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Keywords

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