Samples submitted for the Standard Nutrient Analysis are analyzed for plant available calcium, magnesium, phosphorus, potassium, sulfur, iron, manganese, copper, zinc, aluminum and boron using a modified Morgan extractant. The soil pH and buffer pH are determined and the samples are screened for estimated total lead. Estimated Cation Exchange Capacity and % Base Saturation are also provided. Limestone and fertilizer recommendations are made based on test results and the crop being grown. (Soils sent in our pre-paid soil test collection kits sold by some Cooperative Extension Centers receive this test). The standard nutrient analysis is appropriate for lawns, vegetables, flowers, woody ornamentals, fruits, agronomic crops and for nursery crops (like Christmas trees) grown in mineral soil. This test is not suitable for composts or soilless media.

This analysis is appropriate for soilless greenhouse media or mixes containing 20 percent or less mineral soil. Samples submitted for the Saturated Media Analysis are analyzed for plant available calcium, magnesium, phosphorus, potassium, copper, boron, iron, manganese, and zinc. Quick diagnostic tests estimate nitrate-nitrogen and ammonium-nitrogen. Media pH and soluble salts are also determined. One pint of sample is required for this test. Recommendations for commercial crops can be requested by the University’s Extension Specialist for Greenhouse Crops.

The pH is determined and limestone recommendations are made if the soil pH needs to be increased while sulfur recommendations are given if the soil pH needs to be decreased. Recommendations can only be made if the crop being grown is listed. Soil pH testing is included in the standard nutrient analysis.

The total soluble salts are determined using a 1:2, V:V electrical conductivity method. Interpretation is provided.

This analysis gives the percent organic matter in soil or compost determined by the loss on ignition. Most plants do best in soils with organic matter contents between 4 and 8 percent. Finished composts usually range from 40 to 60 percent organic matter. Recommendations are not made.

The total amounts of sand, silt and clay sized particles are determined using a hydrometer method. Soils are categorized according to USDA soil textural classifications. No recommendations are provided.

The PSNT measures plant available nitrate-nitrogen in the soil and is used by commercial silage corn, sweet corn and pumpkin growers. Turf growers may also find this test useful. From June 1st until mid-August soil test results are ready by the next business day and the grower is contacted with the results and nitrogen fertilizer recommendations via email, fax or phone.