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A Tube Containing Gypsum Blocks for Following Moisture Changes in Undisturbed Soil¹

ABSTRACT

The increased use of gypsum blocks for following soil moisture changes and scheduling irrigations has stimulated efforts to improve their installation, performance, and removal from the field. Gypsum blocks were cast in tubes at 6-inch intervals to simulate the usual practice of installing a series of blocks through the root zone. Three types of block-in-tube constructions were described and results from their use reported. The results indicate that blocks perform satisfactorily when cast in tubes.

The tubes can be quickly installed in an auger or king tube hole, assuring intimate contact with undisturbed soil and roots. The problems associated with back-fill are eliminated and removal at the close of the season is easy. The length of time following installation for equilibrium with the surrounding soil to be reached is reduced.

¹ Published as Technical Paper No. 877 with the approval of the Director as a contribution from the Soils Department, Oregon Agr. Exp. Sta., Corvallis, Oreg.

² Instructor in Soils, Cairo Univ. and Associate Soil Scientist, Oregon State College, respectively.

Received for publication October 21, 1954.