Tips on gypsum application this fall
If Cation Exchange Capacity (CEC) levels are being used to evaluate gypsum application, the suggested application rates are as follows:
CEC levels Rate
Less than 10 0.5 tons/acre
10-15 1.0 tons/acre
Greater than 15 2.0 tons/acre
“Cation Exchange Capacity is the amount of cations a soil can retain. Higher CEC soils have greater capacity to store plant nutrients. Soil CEC increases with more clay, more organic matter and is also influenced by pH,” the company explains.
Gypsoil gypsum is a co-product of the process that cleans the air from coal-fired plants and is sometimes called FGD gypsum or synthetic gypsum. This gypsum is also made as a co-product of certain other processing.
Clean Air Act amendments of 1990, reportedly required new scrubbing systems used by many coal-fired utilities to remove sulfur dioxide (SO2) from their emissions. These scrubbers produce high-quality and very pure FGD gypsum. Supply of this synthetic gypsum is still expanding.