Abstract: The authors provide information on the need to develop a reference material (RM) of the southern middle loamy black soil certifiedfor fertility indicators. The information about the stages of RM development is described: selection and preparation of soil material in the field; procedure of averaging soil material. In the determination of the RM metrological characteristics, the heterogeneity and stability characteristics of the RM are evaluated. The authors demonstrated the results of the RM certification for agrochemical indicators. The correc...
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