Date of Award:

5-1956

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Plants, Soils, and Climate

Department name when degree awarded

Agronomy

Committee Chair(s)

Sterling A. Taylor

Committee

Sterling A. Taylor

Committee

Rex L. Hurst

Abstract

Many problems of management of irrigated soils require a knowledge of the soil moisture status and its relationship to plant growth before they can be solved.

The amount of water in the soil as indicated by moisture content gives no reliable information of its availability for plant growth. It is therefore desirable to obtain a direct measurement of the readiness with which soil water can be obtained by the plant

the "field capacity" and the "wilting percentage" have been helpful in estimating the amount of soil water that can be used by plants.

Soil sampling has been used extensively to determine the irrigation requirements, irrigation efficiency, and the soil moisture depletion of the root zone between irrigations. By referring to corresponding soil moisture release curves, a crude estimate of the degree of availability can also be made. However, soil sampling is laborious and expensive, and if a continuous measure of the force per unit area that must be exerted to remove water from the soil is desired, the results are usually unsatisfactory.

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