Carboxylic acids are added to some gypsum products to act as a ‘complexing agent.’ One of the claims is that these acids make the calcium ‘more available’ for plant uptake.
For the calcium and sulfur to be plant available it needs to be in the soil solution. Using a simple test, one can determine how soluble a product is. Our research has shown that SuperCal SO4 is more soluble than products containing expensive carboxylic acids.
At Calcium Products we know that the main factors affecting gypsum solubility in soil is purity and particle size .
Gypsum is a relatively insoluble material when compared with synthetic fertilizers, so that is why having a finely ground material is paramount to providing effective solubility and plant availability.
Adding an expensive organic acid to an inferior product is only going to cost you more money.
Provide the most effective gypsum available; make the logical and economical choice with SuperCal SO4.