How to Apply Gypsum to Clay Soil 1. Key Terms. Gypsum can reclaim high-sodium or "sodic" soils. While adding gypsum to pure irrigation water is good thing, adding it to saline water or a saline soil is not. Sign up for our newsletter. The first step is to add gypsum to the soil. The effects are short lived but serve to soften the soil enough for plowing and sowing. Agricultural Gypsum (Calcium Sulfate – CaSo 4) Building more productive soil naturally. If you have clay soil, always add about half a coffee can full of gypsum in the bottom of every planting hole and work it into the soil on the bottom of the hole before planting. Discussion in 'Soils, Fertilizers and Composting' started by hironomous, May 18, 2009. hironomous Member. Established lawns: 40 to 50 lbs. If you are spreading gypsum onto soil to prepare … Gypsum may be just the answer for reconditioning the soil, because it can be spread on the surface of the soil like in the vegetable garden, flowerbeds or on the lawn. Water often puddles on the surface of these soils. Retarded growth rate and delayed maturity. A soil test can help determine the amount of clay in your lawn. We also have other products suited for treatment of soil contamination. If the result shows that they are in abundance, it will be pointless to include more in the form of gypsum. Add organic matter. Sodic soils occur almost exclusively in the arid and semiarid West. The two most common soil amendments we have available that supply calcium are lime and gypsum. For light clay about 1Kg/square meter of gypsum is the usual application rate. This Mg is replaced by Ca, improving water holding capacity, root development and soil quality. Over-application of gypsum is generally not a problem because it has low solubility and the increase in salinity is low. [CaMg(CO₃)₂]. When gardeners find they have too much clay in their selected plots, they can change soil structure by adding a soil amendment such as gypsum. Now it only works on some clays - sodic clays. Water it into the ground or let the rains wash it in. Add powdered gypsum at the rate of two to three handfuls per square metre, then dig the soil over and water it in. Garn Wallace, Ph.D., operates Wallace Laboratories in El Segundo, California. If you are planning to plant vegetables, shrubs, and flowers, then mix well 20 to 30 pounds of gypsum per thousand square feet … Gypsum therefore improves soil conditions much more rapidly than lime and will affect soil conditions to a greater depth than lime will. The effect of gypsum on the soil is short-lived. The sulfate in gypsum binds with excess Mg in the soil to form soluble Epsom salt, which moves lower into the soil profile. It must be incorporated into the soil and brought into contact with soil acids before calcium ions (Ca++) are released. No related posts. When using the product, break up the surface of the soil and apply the gypsum at the rate of 1-2Kg per square metre. FGD gypsum usually possesses a much smaller and more uniform particle size (more than 95% < 150 microns) than agricultural mined gypsum that is granulated to produce a final size of 2–4 mm. The gypsum requirement (GR) is the calculated amount of gypsum necessary to add to reclaim the soil. Adding gypsum to the soil will be a good way to loosen the soil. It is also essential for nodule formation on legume roots, and for the characteristic odors of plants such as garlic and onions. Soils in or near some industrialized areas and soils very heavily amended with municipal sewage sludge might contain toxic amounts of heavy metals. 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