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Determination of particle-size distribution employing the most common methods is laborious and time-consuming. The objective of this study was to compare alternative analytical procedures adequate to classify soil texture of cropped soils. Eight Spanish topsoil samples selected according to their organic matter, CaCO 3 , and clay content, from representative agricultural Xerochrepts were tested. Differences in the methodologies were removal by hydrogen peroxide-treatment or no removal of organic matter and overnight mechanical shaking or ultrasonic physical dispersion. The pipette method was used for determination of particle fractions. Correlation for all the three particle sizes was found among the alternative procedures and the standard methodology (with removal of organic matter and mechanical shaking) and regression equations were developed ðR 2 . 0:96Þ: Ultrasonic dispersion was found to be faster than mechanical shaking without 1351

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