Date of Award:

1969

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Plants, Soils, and Climate

Department name when degree awarded

Soils and Irrigation

Advisor/Chair:

R. J. Hanks

Abstract

The objective of this study was to evaluate response times of a salinity sensor and a soil psychrometer. Influences of pressure, temperature and molar concentration changes were to be measured.

Salinity sensor response times ranged from 50 to 130 minutes during solution adsorption while desorption response times were perhaps ten times as long. Temperature affected both response times and equilibrium values, but pressure did not affect either.

Soil psychrometer response times ranged from from 40 to 80 minutes for either adsorption or desorption of solution. However, other factors probably related to indirectness of measurement made the soil psychrometer fail to reflect osmotic potential. Both pressure and temperature effects were significant.

Comparisons between hypothetical soil water infiltration times and sensor response times together with soil psychrometer failure led to the conclusion that the salinity sensor may be useful while the soil psychrometer would probably not be useful for the return-flow water quality control.

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