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Gypsum as an Ameliorant for the Subsoil Acidity Syndrome

Source Publication:Publication No. 01-014-090
Primary Author:Sumner
Institution:University of Georgia Department of Agronomy and Florida Institute of Phosphate Research
Research Site:Experiments were laid out at eight sites throughout Georgia.
State:Georgia
Date/Year:1990
Contact Information:Florida Institute of Phosphate Research 1855 West Main Street Bartow, Florida 33830 (813) 534-7160
Focus:Aluminum
Category:Proceedings & Bulletins & Research Reports
Crop:Silage Corn, Soybeans, Alfalfa, Cotton, Peaches, Lespedeza
Download:EffectofGypsumonDecreasingSubsoilAcidity.pdf (1.0 MB)
Reported Results:

Results show that by-product gypsum is effective in increasing yields of several field crops grown on acid soils by ameliorating aluminum toxicity and supplying needed calcium. In addition, gypsum application resulted in a decrease in penetration resistance of subsoil hardpan layers. This, coupled with the reduced toxicity of the subsoil, promoted deeper root penetration and greater access to soil moisture, thus reducing drought stress. Phosphogypsum and mined gypsum were equally effective for this purpose. Deep tillage of lime is a practice that has been used to reduce subsoil acidity, but gypsum, because of its greater solubility, can be used effectively through the less-costly method of surface application.

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