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Soil Sampling in Relation to Soil Heterogeneity¹

ABSTRACT

Seven cultivated fields, pastures, and orchards—ranging from 2 to 35 acres in size—were sampled for one or more of the following: soil pH, soil moisture, and extractable K, Ca, Mg, and P. Cores 1 inch in diameter were obtained at various depths in a two- and three-stage sampling scheme. For fairly uniform fields, the efficiency of multistage sampling relative to simple random sampling was found to be high. The data show that a convenient multistage sampling method could be used in many physical and chemical sampling surveys of fairly uniform fields or fields that could be stratified into uniform sections.

¹ Contribution of the Department of Soils, Florida Agr. Exp. Sta., Gainesville. Florida Agr. Exp. Sta. Journal Series, No. 443. Presented before Div. IV, Soil Science Society of America, Davis, Calif., Aug. 16, 1955.

² Associate Soil Physicist, Soil Technologist, and formerly Assistant Professor of Statistics, Univ. of Florida, respectively. The latter is now with the Dept. of Experimental Statistics, North Carolina State College.

Received for publication March 28, 1958. Accepted for publication April 24, 1958.