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Extraction of Soil Solution Using a Simple Centrifugation Method for Pesticide Adsorption-Desorption Studies¹

ABSTRACT

A simple and rapid centrifugation technique has been devised to extract small samples of soil solution from moist pesticide-treated soils to allow measurement of the pesticide equilibrium concentration. Energy status of the soil water extracted was characterized by correlating the amount of centrifugal force applied, soil moisture content, and matric potential. By varying the size of soil samples and the centrifugal force applied, a sizable volume of soil solution (40 to 53% of the moisture content at or below 0.3 bar suction) was obtained from the soil. The pesticide equilibrium concentration of the soil solution remained relatively constant throughout the centrifugation process.

¹ Published with the approval of the Director as Paper No. 5346, Journal Series, Nebraska Agric. Exp. Stn.

² Formerly Graduate Research Assistant, Univ. of Nebraska, presently Research Assistant, Western Washington Res. and Ext. Center, Wash. State Univ., Puyallup, WA 98371, and formerly Professor of Agronomy, Univ. of Nebraska, presently Professor of Agronomy Univ. of Arkansas, Fayetteville, AR 72701.

Received for publication May 20, 1977. Accepted for publication December 23, 1977.