Apply gypsum after winter wheat to improve soil

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Mid-summer, after wheat harvest, is the perfect opportunity to apply gypsum to improve soils.

"More and more farmers are turning to low-cost gypsum to improve soil tilth and water permeability, and to increase biological activity in the soil,” says Ron Chamberlain, director of gypsum programs for Beneficial Reuse Management, marketer of Gypsoil brand gypsum.

“Applying gypsum to wheat stubble after harvest is ideal because it doesn’t compete with other fieldwork, equipment is available, and it gives gypsum a head start on the work it does in the soil profile,” Chamberlain says.

Gypsum is calcium sulfate dihydrate, a highly soluble compound that is carried readily into the soil profile by rainfall. It adds calcium and sulfur to the soil. Sulfur, especially, is deficient in many Midwestern soils.

Softer, healthier soils

The calcium in gypsum helps neutralize metals and chemical salts that bind with clay, causing soils to crust and clump. This can lead to ponding and erosion. Gypsum loosens the soil, improving water infiltration and reducing runoff. It also helps create a better environment for earthworms and soil microbes.

“Gypsum following wheat is almost a perfect combination for soil improvement. Wheat is a deep-rooted grass that sends organic matter and nutrients in the form of roots deep into the soil profile,” says Chamberlain. “Gypsum loosens the soil and increases the biological activity that eventually breaks down those roots and frees up the nutrients for the following crop.”  Typical application rates are 1-2 tons/acre.

Gypsum is one of the oldest fertilizers used in agriculture, and is often used in home gardens.  Ben Franklin was a strong advocate who recognized its benefits for crop production more than 200 years ago. However, except for certain specialty crops such as peanuts and potatoes, gypsum has not been widely used in cropping systems until recently because it is expensive to mine and transport.

But now there are new, inexpensive sources of gypsum.

Gypsoil brand gypsum is a byproduct of the process that cleans – or “scrubs” – air from coal-burning power utilities by removing sulfur dioxide (SO2) from flue gases. The resulting synthetic gypsum, sometimes called FGD (flue gas desulfurization) gypsum, has been shown to be even purer than most mined gypsum.

Due to the increased use of scrubbers, as well as the production of gypsum from other industrial processes, gypsum is now cheaper and more economical to use than in the past.

Beneficial Reuse Management (BRM) identifies byproducts of manufacturing processes that can be used in safe and effective ways to benefit land owners, conserve natural resources and preserve landfill space. BRM is rapidly building a distribution network to make Gypsoil brand gypsum widely available to Midwestern producers.


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