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dc.contributor.authorStark, Earl Frederick,1909-
dc.creatorStark, Earl Frederick,1909-en_US
dc.date.accessioned2011-11-28T13:53:35Z
dc.date.available2011-11-28T13:53:35Z
dc.date.issued1942en_US
dc.identifier.urihttp://hdl.handle.net/10150/191397
dc.description.abstractIn a partial survey of Arizona waters, surface waters tested were found to be lower than the accepted toxicity level for most crops. Some of the pumped irrigation water analyzed contained excessive amounts of boron; but in most oases the availability of alternate sources permits blending of waters so that the problem is obviated. Analyses bf plant materials show that a correlation exists between the amount of boron in irrigation water and the amount of boron taken up by the plant.. Foliar toxicity symptoms sometimes are evident Studies were conducted which showed that the amount of boron fixed by a soil is a function of soil texture, as well as the boron concentration of the equilibrium solution with which the soil is in contact. When the, equilibrium concentration of the boron in the two phases was plotted, a linear relationship existed in which the slope of the fixation curves for heavy soils contrasted with that for light textured soils. Data are at hand which indicate that boron fixation is a temporary process, pending percolation of boron-free water through the soil, the release of boron being enhanced when the percolating water has a low pH value. In sand cultures of cotton and sunflower plants grown in media containing a range of boron and lime concentrations, the results were interpreted to best advantage by use of the calcium: boron ratio; this fluctuates widely, as does the yield, when boron is limiting in a soil. Calcium carbonate amelioral to some extent the toxic effect of boron in plants.
dc.language.isoenen_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshPlants -- Effect of boron on.en_US
dc.subject.lcshBoron.en_US
dc.titleBoron in the irrigation waters and alkaline calcareous soils of Arizona with particular reference to its effects on plants,en_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.contributor.chairSmith, H. V.en_US
dc.identifier.oclc214343081en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineAgricultural Chemistry and Soilsen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.nameM.S.en_US
dc.description.notehydrology collectionen_US
refterms.dateFOA2018-08-24T10:16:00Z
html.description.abstractIn a partial survey of Arizona waters, surface waters tested were found to be lower than the accepted toxicity level for most crops. Some of the pumped irrigation water analyzed contained excessive amounts of boron; but in most oases the availability of alternate sources permits blending of waters so that the problem is obviated. Analyses bf plant materials show that a correlation exists between the amount of boron in irrigation water and the amount of boron taken up by the plant.. Foliar toxicity symptoms sometimes are evident Studies were conducted which showed that the amount of boron fixed by a soil is a function of soil texture, as well as the boron concentration of the equilibrium solution with which the soil is in contact. When the, equilibrium concentration of the boron in the two phases was plotted, a linear relationship existed in which the slope of the fixation curves for heavy soils contrasted with that for light textured soils. Data are at hand which indicate that boron fixation is a temporary process, pending percolation of boron-free water through the soil, the release of boron being enhanced when the percolating water has a low pH value. In sand cultures of cotton and sunflower plants grown in media containing a range of boron and lime concentrations, the results were interpreted to best advantage by use of the calcium: boron ratio; this fluctuates widely, as does the yield, when boron is limiting in a soil. Calcium carbonate amelioral to some extent the toxic effect of boron in plants.


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