The role of gypsum in adjusting soil pH may be confusing. Incorn and soybean growing areas, soil pH in the range of 6 to 7 is preferred for optimal growth and yield. Soil pH encountered in most areas of the north-central region of the U.S.range from 5 to 8. Within the pH range of 4.5 to 8.4, the addition of gypsum will have no effect on soil pH. The reaction will be as follows: CaSO, + Sod2-t Ca2- Dissolving gypsum in water does not result in net change in soil water charge.
Dear Sir. Concerning your issue about the effects of Gypsum in pH Soil . However, some believe that gypsum increases the pH of growing media as well. Why? Gypsum is calcium sulfate and it is assumed that calcium causes the pH of growing media to rise. Like gypsum, limestone contains calcium in the form of calcium carbonate. However, it is not calcium that increases the pH of growing media, but rather carbonate, by neutralizing acid (hydrogen ions). Likewise, calcium coming from gypsum does not increase a growing medium's pH. Individually calcium and sulfate can alter the pH of the growing medium immediately surrounding the roots, but the plant takes up both elements in nearly equal amounts through its roots. The result is a neutral effect on the pH of the growing medium. Gypsum should not be used as a limestone substitute, but as a fertilizer supplement to provide calcium and sulfate, both of which plants need for healthy growth. I think the following below links may help you in your analysis:
https://vric.ucdavis.edu/pdf/soil/ChangingpHinSoil.pdf
https://www.pthorticulture.com/en/training-center/myth-series-gypsum-changes-the-ph-of-growing-media/
https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1922&context=extension_curall
Thanks
Dear Sir. Concerning your issue about the effects of Gypsum in pH Soil . However, some believe that gypsum increases the pH of growing media as well. Why? Gypsum is calcium sulfate and it is assumed that calcium causes the pH of growing media to rise. Like gypsum, limestone contains calcium in the form of calcium carbonate. However, it is not calcium that increases the pH of growing media, but rather carbonate, by neutralizing acid (hydrogen ions). Likewise, calcium coming from gypsum does not increase a growing medium's pH. Individually calcium and sulfate can alter the pH of the growing medium immediately surrounding the roots, but the plant takes up both elements in nearly equal amounts through its roots. The result is a neutral effect on the pH of the growing medium. Gypsum should not be used as a limestone substitute, but as a fertilizer supplement to provide calcium and sulfate, both of which plants need for healthy growth. I think the following below links may help you in your analysis:
https://vric.ucdavis.edu/pdf/soil/ChangingpHinSoil.pdf
https://www.pthorticulture.com/en/training-center/myth-series-gypsum-changes-the-ph-of-growing-media/
https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1922&context=extension_curall
Thanks
https://onpasture.com/2014/06/02/when-to-use-lime-gypsum-and-elemental-sulfur/
http://www.gypsoil.com/news-and-events/gypsum-and-lime
Applying lime to a soil will raise the pH. ... Gypsum is neutral in pH, and since it has no carbonate ion as part of its makeup, it will not neutralize acidity. However, it is much more soluble than most lime products (about 200 times as soluble), so it does make a very good source for soluble calcium and sulfate
Ok, thanks to all the friends who have responded to my question. But I am still unclear about the role of sulfate ions in reducing soil pH.
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