Persistent Link:
http://hdl.handle.net/10150/204250
Title:
Water Stress Indices for Research and Irrigation Scheduling in Pearl Millet
Author:
Teowolde, Haile; Voigt, Robert L.; Osman, Mahamoud; Dobrenz, Albert K.
Issue Date:
Sep-1987
Publisher:
College of Agriculture, University of Arizona (Tucson, AZ)
Journal:
Forage and Grain: A College of Agriculture Report
Abstract:
The capability to measure the magnitude of water stress in plants is useful for precision irrigation scheduling and other purposes. This paper reports an evaluation of leaf (TL) and canopy (Tc) temperatures, leaf minus air (TL -Ta) and canopy minus air (Tc -Ta) temperatures, and leaf water stress index (LWSI) and crop water stress index (CWSI) in detecting stress in pearl millet (Pennisetum americanum (L.) Leeke) over two growing seasons. Baselines which were used to compute LWSI and CWSI were obtained. The upper and lower baselines for the Tc data, respectively, were Tc -Ta = 4.10 C and Tc -Ta = 3.87- .2001VPD where VPD is vapor pressure deficit in mbars. For the TL data, the upper and lower baselines, respectively, were TL -Ta = 1.97oC and TL -Ta = 1.308- .03006VPD. Tests against photosynthesis, transpiration, and grain yield showed that LWSI and CWSI are better indices of stress than TL -Ta, Tc -Ta, TL, Tc, or Ta. Average seasonal LWSI and CWSI ranged from approximately 0.03 for non- stressed to 0.80 for stressed plants. The reliability of LWSI and CWSI to detect stress and their relation with grain yield suggested the possibility of using these indices for irrigation scheduling decisions.
Keywords:
Agriculture -- Arizona; Grain -- Arizona; Forage plants -- Arizona; Millet -- Arizona; Sorghum -- Arizona; Millet -- Water; Sorghum -- Water
Series/Report no.:
370071; Series P-71

Full metadata record

DC FieldValue Language
dc.titleWater Stress Indices for Research and Irrigation Scheduling in Pearl Milleten_US
dc.contributor.authorTeowolde, Haileen_US
dc.contributor.authorVoigt, Robert L.en_US
dc.contributor.authorOsman, Mahamouden_US
dc.contributor.authorDobrenz, Albert K.en_US
dc.date.issued1987-09-
dc.publisherCollege of Agriculture, University of Arizona (Tucson, AZ)en_US
dc.identifier.journalForage and Grain: A College of Agriculture Reporten_US
dc.description.abstractThe capability to measure the magnitude of water stress in plants is useful for precision irrigation scheduling and other purposes. This paper reports an evaluation of leaf (TL) and canopy (Tc) temperatures, leaf minus air (TL -Ta) and canopy minus air (Tc -Ta) temperatures, and leaf water stress index (LWSI) and crop water stress index (CWSI) in detecting stress in pearl millet (Pennisetum americanum (L.) Leeke) over two growing seasons. Baselines which were used to compute LWSI and CWSI were obtained. The upper and lower baselines for the Tc data, respectively, were Tc -Ta = 4.10 C and Tc -Ta = 3.87- .2001VPD where VPD is vapor pressure deficit in mbars. For the TL data, the upper and lower baselines, respectively, were TL -Ta = 1.97oC and TL -Ta = 1.308- .03006VPD. Tests against photosynthesis, transpiration, and grain yield showed that LWSI and CWSI are better indices of stress than TL -Ta, Tc -Ta, TL, Tc, or Ta. Average seasonal LWSI and CWSI ranged from approximately 0.03 for non- stressed to 0.80 for stressed plants. The reliability of LWSI and CWSI to detect stress and their relation with grain yield suggested the possibility of using these indices for irrigation scheduling decisions.en_US
dc.subjectAgriculture -- Arizonaen_US
dc.subjectGrain -- Arizonaen_US
dc.subjectForage plants -- Arizonaen_US
dc.subjectMillet -- Arizonaen_US
dc.subjectSorghum -- Arizonaen_US
dc.subjectMillet -- Wateren_US
dc.subjectSorghum -- Wateren_US
dc.identifier.urihttp://hdl.handle.net/10150/204250-
dc.relation.ispartofseries370071en_US
dc.relation.ispartofseriesSeries P-71en_US
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