Abstract
Abstract Inconsistencies in test results and recommendations among service laboratories often contribute to lack of confidence in soil testing as a diagnostic tool. The North Central Regional Committee on Soil Testing (NCR‐13) recently surveyed testing procedures and conducted a soil sample exchange. These studies indicated considerable diversity in procedures and variations in phosphorus test results among university laboratories. The variations may be due to the following causes: terminology, extractant, extraction vessel, speed and time of shaking. An extraction study showed that, with the Erlenmeyer flask, speed and time of shaking had little effect on the amount of phosphorus extracted. Low phosphorus test values were obtained with a straight walled bottle at speeds of less than 200 OPM due to poor sample agitation. Standardization of soil measuring scoops and a regional bulletin describing recommended testing procedures are steps taken towards greater uniformity.
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