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The Use of Undisturbed Soil Cores to Investigate the Reclamation of Saline and Alkali Soils¹

ABSTRACT

Field leaching investigations relative to the reclamation of saline and alkali soils generally require considerable land area, as well as time and personnel, for establishing and maintaining such studies. Concurrent with a field leaching experiment a laboratory leaching study was made to determine the relationship between results obtained from undisturbed cores in the laboratory and those obtained from field plots. Changes in infiltration rate, soluble salts, and exchangeable-sodium-percentage due to leaching, with and without gypsum, were compared.

In view of the similarity of results obtained from undisturbed cores in the laboratory and field plots, it appears that soil cores, properly encased, can be used to predict with reasonable accuracy the reclaimability of saline and alkali soils. Although laboratory studies will not replace field investigations, cores could be used in making preliminary studies during period outside of the field season. The information thus obtained could then be used in the final selection of treatments to be considered in the field.

¹ Joint contribution of the Colorado Agr. Exp. Sta. and U.S.D.A., Agricultural Research Service, S.W.C.R.D., Western Soil and Water Management Branch. This report is based on research partially supported by funds from Regional Research Project W-29. Authorized by the Director of the Colorado Agr. Exp. Sta. as Scientific Journal Series No. 519. Presented before the Western Society Soil Science, Aug. 27, 1957, Palo Alto, Calif.

² Assoc. Agronomist (Soils), Colorado Agr. Exp. Sta. and Soil Scientist, U.S.D.A., Agricultural Research Service, S.W.C.R.D.; and Asst. Agronomist (Soils) Colorado Agr. Exp. Sta., respectively. The authors wish to acknowledge the assistance of C. L. Horton, Agr. Aid, in the preparation of undisturbed cores used in this study.

Received for publication August 12, 1957. Accepted for publication October 18, 1957.