Asoil test is alaboratory orin-situ analysis to determine the chemical, physical or biological characteristics of a soil. Possibly the most widely conducted soil tests are those performed to estimate the plant-available concentrations ofnutrients in order to providefertilizer recommendations in agriculture. Ingeotechnical engineering, soil tests can be used to determine the current physical state of the soil, theseepage properties, theshear strength and thedeformation properties of the soil. Other soil tests may be used ingeochemical orecological investigations.

Inagriculture, asoil test commonly refers to theanalysis of asoil sample to determinenutrient content, composition, and other characteristics such as theacidity. A soil test can determinefertility, or the expected growth potential of the soil which indicates nutrient deficiencies, potential toxicities from excessive fertility and inhibitions from the presence of non-essentialtrace minerals. The test is used to mimic the function of roots to assimilate minerals. The expected rate of growth is modeled by theLaw of the Maximum.^[1]

Labs, such as those atIowa State andColorado State University, recommend that a soil test contains 10-20 sample points for every 40 acres (160,000 m²) of field.Tap water or chemicals can change the composition of the soil, and may need to be tested separately. As soil nutrients vary with depth and soil components change with time, the depth and timing of a sample may also affect results.

Composite sampling can be performed by combining soil from several locations prior to analysis. This is a common procedure, but should be used judiciously to avoid skewing results. This procedure must be done so that government sampling requirements are met. A reference map should be created to record the location and quantity of field samples in order to properly interpret test results.

Inprecision agriculture, soil samples may be geolocated using GPS technology in order to estimate the geospatial distribution of nutrients in the sampled area. The geolocated samples are collected using a distribution and resolution that allows for the estimation of the geospatial variability of the soil area where the crop will be grown. Many different distributions and resolutions are used, depending upon many factors including the goals of the geospatial nutrient analysis and cost of sample collection and analysis.^[2][3]

For example, in the United States corn and soybean growing regions a grid distribution with a resolution of 2.5 acres per grid (one sample for each 2.5 acre grid) is offered by many precision agriculture soil test service providers. This is generally referred to as grid soil testing.

Soil chemistry changes over time, as biological and which chemical processes break down or combine compounds over time. These processes change once the soil is removed from its natural ecosystem (flora and fauna that penetrate the sampled area) and environment (temperature, moisture, and solar light/radiation cycles). As a result, the chemical composition analysis accuracy can be improved if the soil is analyzed soon after its extraction — usually within a relative time period of 24 hours. The chemical changes in the soil can be slowed during storage and transportation by freezing it. Air drying can also preserve the soil sample for many months.

Soil testing is often performed by commercial labs that offer a variety of tests, targeting groups of compounds and minerals. Laboratory tests often check for plant nutrients in three categories:

• Major nutrients:nitrogen,phosphorus, andpotassium
• Secondary nutrients:sulfur,calcium,magnesium
• Minor nutrients:iron,manganese,copper,zinc,boron,molybdenum,chlorine

The amount of plant-availablephosphorus is most often measured with a chemical extraction method, and different countries have different standard methods. Just in Europe, more than 10 different soil phosphorus tests are currently in use and the results from these different tests are not directly comparable.^[4]

Do-it-yourself kits usually only test for the three "major nutrients", and for soilacidity orpH level. Do-it-yourself kits are often sold at farming cooperatives, university labs, private labs, and some hardware and gardening stores.Electrical meters that measure pH, water content, and sometimes nutrient content of the soil are also available at many hardware stores. Laboratory tests are more accurate than tests with do-it-yourself kits and electrical meters. Anexample soil sample report is provided for reference by Wallace Laboratories LLC.

In order to avoid complex and expensive analytical techniques, prediction based on regression equations relating to more easily measurable parameters can be provided bypedotransfer functions. For instance, soil bulk density can be predicted using easily measured soil properties such as soil texture, pH and organic matter.^[5]

Soil testing is used to facilitate fertilizer composition and dosage selection for land employed in both agricultural and horticultural industries.

Prepaid mail-in kits for soil and ground water testing are available to facilitate the packaging and delivery of samples to a laboratory. Similarly, in 2004, laboratories began providing fertilizer recommendations along with the soil composition report.

Lab tests are more accurate and often utilize very preciseflow injection technology (or Near InfraRed (NIR) scanning^[6][7]). In addition, lab tests frequently include professional interpretation of results and recommendations. Provisory statements included in a lab report may outline any anomalies, exceptions, and shortcomings in the sampling, analytical process or results.

Some laboratories analyze for all 13 mineral nutrients and a dozen non-essential, potentially toxic minerals utilizing the "universal soil extractant" (ammonium bicarbonateDTPA).^[8]

Ingeotechnical engineering, asoil test can be used to determine the physical characteristics of a soil, such as itswater content,void ratio orbulk density. Soil testing can also provide information related to theshear strength, rate ofconsolidation andpermeability of the soil. The following is a non-exhaustive list of engineering soil tests.

Common mineralsoil contaminants includearsenic,barium,cadmium,copper,mercury,lead, andzinc.

Lead is a particularly dangerous soil component. The following table from theUniversity of Minnesota categorizes typical soil concentration levels and their associated health risks.^[9]

The following is a non-exhaustive list of recommendations to limit exposure to lead in garden soils:

1. Locate gardens away from old painted structures and heavily traveled roads
2. Give planting preferences to fruiting crops (tomatoes, squash, peas, sunflowers, corn, etc.)
3. Incorporate organic materials such as finishedcompost, humus, and peat moss
4. Lime soil as recommended by soil test (a pH of 6.5 minimizes lead availability)
5. Discard old and outer leaves before eating leafy vegetables; peel root crops; wash all produce
6. Keep dust to a minimum by maintaining a mulched and/or moist soil surface

• Base-cation saturation ratio
• Fertilizer
• Geotechnical investigation
• Liming (soil)
• Plant tissue test
• SESL Australia

• Pollutants/Toxics > Soil Contaminants
• Common Contaminants
• Colorado State University Extension Service
• Mail-in soil test kits and nutrient management/fertilizer reports
• Field Book for Describing and Sampling Soils

• Soil tests
• In situ geotechnical investigations

• Articles with short description
• Short description matches Wikidata