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Quarting - a method of mechanical averaging of a soil sample. The ground soil material, after thorough mixing, is arranged on paper in the form of a square and divided by diagonals into four equal parts. Two opposite parts are taken for further analysis
Source: "Methodological Guidelines. Environmental Protection. Soils. Methods for Collecting Combined Soil Samples and Assessing Contamination of Agricultural Land with Residual Quantities of Pesticides. RD 52.18.156-99"
(approved by Roshydromet)