Gypsum has been used to improve soil structure. Gypsum isn't toxic, won't change your soil's pH and is ideal for high-sodium soils in coastal gardens. Clay soils in commercial agricultural sites are often treated with gypsum to help break up the clay and enhance calcium, which breaks up excess sodium. Hence clay soils are heavy and wet. Gypsum is still available, but it’s not recommended for general use. A saline sodic clay or dirt is one that is both saline (> 1 to 2 dS/m) and sodic (SAR > 13 and ESP > 15) and contains both high levels of soluble salts and exchangeable sodium. To appreciate the usefulness of lime, it is necessary to understand soil pH. It is also the soil amendment most likely to be misused. We supply both mined and recycled material. Apply gypsum at 1 kilo per square metre, digging this into the top 10-15cm well. Gypsum (calcium sulfate) is used specifically as a chemical remedy in crusty clay soils containing excess sodium (called “sodic soils”). Flocculation is the process in which manyindividual small clay particles are bound together in fewer but larger particles. I've applied Gypsum to my own lawn over the years (pellitized with sulfur) because of our heavy soils, also high in pH. I know it is, but I am scptical. Recycled gypsum now requires a deployment application from the EA. In the vegetable garden. It’s no surprise that gypsum is best suited for heavy clay soils. If the clay soil is dry, water after applying Gypsum. for every 100 square feet. 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Gypsum works in two ways. Benefits of Gypsum. You can add gypsum, composted leaves, pine bark, or organic compost to your clay soil to eliminate compaction and drainage problems and to improve its structure. Core aerification is the best way to improve growing conditions for lawns established on clay soils. Had a customer (HOA) call today and inquire about Gypsum for their lawns. Releases calcium and sulphur into the soil. Gypsum makes clay soils less compact and hard and better able to accept air and nutrients that plants need. Clay soil & gypsum. Sodic clay soils, by contrast, are more likely to be poorly structured and difficult to manage. Gypsum for Agriculture www.4r-group.co.uk See over for further details Gypsum as a soil conditioner • Improves soil structure and tilth, particularly on heavier soils. Soils with larger particles have more air space and allow the passage of water more freely. Water often puddles on the surface of these soils. 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