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Potential Contamination of Aluminum and Lead in a Soil Test Report

Potential Contaminates of Aluminum and Lead in a Soil Test Report Professor DeBacco Aluminum Not Essential Plant Nutrient Aluminum is not an essential plant nutrient, though it is common in some soils. High levels of aluminum in the soil can also interfere with plant uptake of phosphorus and may cause injury of sensitive plant species like lettuce and beets As the soil pH decreases, the solubility of aluminum increases. pH Impacts on Aluminum Soil test results often indicate elevated aluminum levels in soils with pH levels below 5.0. Liming soils (which will increase the pH) to an acceptable level for the crop being grown will reduce the amount of aluminum available to plants. Lead Lead is a natural occurring element in soils and typically is present in soils in the range of 5 to 100 ppm total lead. Soil test results indicate an estimation of total lead. Lead Levels of Concern Only when total lead levels exceed 400 ppm does the U.S. Environmental Protection Agency (EPA) list it as an element of concern. If the lead levels are elevated, you should receive appropriate information about potential problems with elevated lead levels and gardening practices to minimize exposure to lead. Soil Lead Levels No federal standard for soil lead has been determined for soils where vegetables will be grown. It is well known that plants vary in their uptake of soil lead but generally lead will accumulate in green leafy tissues and in plant roots. The University of Connecticut Soil Nutrient Analysis Laboratory strongly recommends that soils containing 400 ppm total lead or greater should not be used for growing vegetables, herbs and other food crops. Best Management Practices for Garden Soils Containing Lead Gardens should be located away from older, painted structures and heavily traveled roads. Give planting preference to fruiting crops like tomatoes, squash and peppers on soils with elevated lead levels. Remove outside leaves of green leafy vegetables, peel root crops, and wash all vegetables thoroughly to remove soil particles. Maintain the soil pH at 6.5 to 7.0 by applying limestone at recommended rates to reduce the availability of lead uptake by plants. Maintain soil organic matter levels between 5 and 10 percent. Organic particles will bind with lead making it less available for plant uptake. Maintain soil phosphorus levels by applying the recommended amounts of fertilizer to garden plots.1.Phosphorus can reduce lead uptake by plants. Minimize dust and exposure to bare soil through use of mulches. Wash hands thoroughly after contact with lead contaminated soil. Do not bring food or drinks into areas of contaminated soil. Soil on tools, gloves and shoes will have elevated levels of lead also. Clean before storing or bringing indoors. Consider raised beds or containerized plantings in soils with elevated lead levels. Link to Lecture Slides: https://drive.google.com/file/d/1_TdP... *Due to the description character limit the full work cited for "Potential Contamination of Aluminum and Lead in a Soil Test Report" can be viewed at... https://drive.google.com/file/d/1FM0B...