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COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS Vol. 35, Nos. 3 4, pp. 537 545, 2004. A Simple RollerMill Grinding Procedure for Plant and Soil Samples # S. L. Arnold * and J. S. Schepers. USDAARSSWCRU, University of Nebraska, Lincoln, Nebraska, USA. ABSTRACT. Obtaining finely ground, homogeneous plant and soil samples for