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dc.contributor.authorMartin, R. J.
dc.date.accessioned2010-03-09T01:27:47Z
dc.date.available2010-03-09T01:27:47Z
dc.date.issued1977
dc.identifier.urihttps://hdl.handle.net/10182/1458
dc.description.abstractThe influence of soil moisture status and various meteorological parameters on the water relations of wheat were studies both in the field and under controlled environment conditions. Water potentials of the leaf and ear were measured with a pressured bomb, and leaf diffusion resistance with a diffusion porometer. In the field there was a marked diurnal variation in leaf and ear water potential which closely followed the daily pattern of air temperature and humidity changes, ear water potentials being higher than leaf water potential. Differences in evaporative conditions between days had little effect on leaf water potential when soils were dry. Irrigation only partially alleviated the fall in leaf and ear water potential during the day. Leaf diffusion resistance was closely related to solar radiation, but was unaffected by leaf water potential under relatively moist soil conditions. Diffusion resistance of the lower leaf surface was about double that of the upper surface. Under controlled environment conditions, leaf water potential and diffusion resistance were related to soil moisture status and transpiration under three different temperature and humidity conditions. Despite large differences in transpiration, leaf water potential was not affected by the differences in evaporative demand, but was closely related to soil moisture status. Diffusion resistance changed little until a critical leaf water potential was reached thereafter increasing rapidly, particularly on the lower surface of the leaf. This increase was accompanied by a fall in the transpiration rate, which in turn, was closely linked to an increase in the resistance to water flow from the soil to the leaf. When wilted plants were rewatered, leaf water potential recovered more rapidly than did diffusion resistance.en
dc.language.isoenen
dc.publisherLincoln College, University of Canterburyen
dc.rights.urihttps://researcharchive.lincoln.ac.nz/page/rights
dc.subjectwheaten
dc.subjectenvironmental effectsen
dc.subjectwater stressen
dc.subjectsoil moistureen
dc.subjectleaf diffusionen
dc.subjectleaf water potentialen
dc.subjecttranspirationen
dc.subjectwater relationsen
dc.subjectclimateen
dc.subjectcereal agronomyen
dc.titleSome environmental effects on the water status of wheaten
dc.typeThesisen
thesis.degree.grantorUniversity of Canterburyen
thesis.degree.levelDoctoralen
thesis.degree.nameDoctor of Philosophyen
dc.subject.marsdenFields of Research::300000 Agricultural, Veterinary and Environmental Sciences::300200 Crop and Pasture Production::300201 Plant biochemistry and physiologyen
dc.subject.marsdenFields of Research::300000 Agricultural, Veterinary and Environmental Sciences::300300 Horticulture::300302 Plant growth and developmenten
dc.subject.marsdenFields of Research::300000 Agricultural, Veterinary and Environmental Sciences::300200 Crop and Pasture Production::300205 Agronomyen
lu.thesis.supervisorDougherty, C. T.
lu.contributor.unitDepartment of Agricultural Sciencesen
dc.rights.accessRightsDigital thesis can be viewed by current staff and students of Lincoln University only. If you are the author of this item, please contact us if you wish to discuss making the full text publicly available.en


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