The Use and Duty of Water in the Salt River Valley
Issue Date
1927-07-01Keywords
Agriculture -- ArizonaIrrigation -- Arizona -- Salt River Valley
Irrigation efficiency -- Arizona -- Salt River Valley
Alfalfa -- Irrigation -- Arizona
Cotton -- Irrigation -- Arizona
Irrigation -- Research -- Arizona -- Salt River Valley
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Show full item recordSeries/Report no.
Bulletin (University of Arizona, Agricultural Experiment Station) No. 120Description
This item was digitized as part of the Million Books Project led by Carnegie Mellon University and supported by grants from the National Science Foundation (NSF). Cornell University coordinated the participation of land-grant and agricultural libraries in providing historical agricultural information for the digitization project; the University of Arizona Libraries, the College of Agriculture and Life Sciences, and the Office of Arid Lands Studies collaborated in the selection and provision of material for the digitization project.Preface by G. E. P. Smith
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Decline in Water Uptake by Irrigated Cotton During Boll Filling, and its Amelioration by Daily Drip IrrigationIn 1984,1985, and 1986, leaf water potentials of irrigated cotton declined markedly as the crop approached cutout. Midday transpiration rates also declined, indicating a water-stressed condition. The water stress occurred despite the fact that measurements were made only when the soil was fully charged with water. In 1986, plant hydraulic conductances were estimated. The conductance was high early in the season, declined to a low value during cutout, and increased during regrowth to the high value of the early season. It is suggested that root length and efficiency of water uptake, or both, decrease during boll filling as most assimilates are partitioned into the bolls. Daily drip irrigation prevented this susceptibility to stress during boll filling. In 1984 and 1986, drip irrigation decreased the length and severity of cutout, resulting in an increased boll load at the end of the season.
