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High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! In agriculture, a soil test is the analysis of a soil sample to determine nutrient content, composition and other characteristics, including contaminants. Tests are usually performed to measure fertility and indicate deficiencies that need to be remedied. The quality of the original soil sample plays a key role in determining the practical value of test results. Most labs will provide documentation outlining the proper procedures for collecting soil samples. Labs, such as Iowa State and Colorado State University, recommend that you take between 10-20 samples for every 40 acres (160,000 m2) of the field. Sampling implements must be properly cleaned prior to sampling, and must be cleaned between samples to avoid cross-contamination (especially when sampling and testing for soil contaminants). The tool should be free of rust, and washed with distilled water. Doing so will clean the tool, but alsonot add any minerals or elements from regular tap water or chemicals that could change the composition of the soil.