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Automated Repetitive Short-Term Extraction of Soil Samples¹

ABSTRACT

Studies of P release during short contact times between soil and extractant were conducted on soils with an automatic sequential extracting apparatus. Varying contact times between the soil and extracting solution can be set by an adjustable multigang timer of 20-min cycle. Data for two soils of different textures show marked differences in P extraction. The apparatus appears adaptable for evaluating short-term release of other ions and pesticides from soils.

¹ Contribution from the Dep. of Agronomy, Kentucky Agr. Exp. Sta. Lexington. This paper (No. 72-3-113) is published with the approval of the Director of the Kentucky Agr. Exp. Sta.

² Formerly Graduate Research Assistant, University of Kentucky, now Agronomist, Int. Inst. of Tropical Agr., Ibadan, Nigeria, and Professor, Dep. of Agronomy, Univ. of Kentucky, respectively.

Received for publication August 14, 1972. Accepted for publication January 29, 1973.