Date of Award:

1967

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Plants, Soils, and Climate

Department name when degree awarded

Soil Physics

Advisor/Chair:

Sterling A. Taylor

Abstract

  1. Changes in the energy status of water that occurred in Milville silt loam and in bean (Phaseolus vulgaris L.) plants growing on it , during two consecutive 6-day periods while being irrigated with saline solutions, were studied.
  2. Total soil water potential (Ψ soil) (measured with thermocouple psychrometers), matric-potential (Ψm) (measured with tensiometers) were considered. In leaf samples, the total water potential (leaf) and the osmotic potential (Ψπ)--after freezing-- were determined with thermocouple psychrometers; by difference, the pressure potential (Ψp) was obtained.
  3. There is no evidence of close relationship between changes taking place in the values of the leaf water potential (or its components) and changes that occur in the energy status of the soil solution.
  4. Also, there is a lack of close relationship between the concentration of the solutions added and the resulting water potentials in the soil solution.
  5. Results indicate that the soil water potential exerts increasing control of leaf water potential as it decreases. In addition, there is a smaller range of values of leaf water potentials when the saltier solutions (C and D) are used for irrigations. Also, the osmotic potential is higher in leaves of plants grown in pots watered with saltier water.
  6. High values of pressure potentials (Ψp)--low turgor-calculated for leaf samples, where no wilting symptoms were visible, suggest that there are differences among plant species with regard to the turgor level at which wilting occurs.

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Soil Science Commons

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