In deciding which gypsum to buy, the main points to consider are: the total cost of supply and application of gypsum, expressed on the basis of pure CaSO4.2H20 (Regyp - 90%+ pure), how quickly the gypsum dissolves in water (Regyp - up to four faster), how easily and evenly it spreads (Regyp - up to 30%
There are three main ways in which soils can be tested for likely gypsum response. These are: 1. On-farm tests, these are the quickest but least reliable means of assessing likely gspsum response. The simplest test is to drop about eight small (3-5 mm diameter) air-dry aggregates of soil into a container of rainwater or
Steps to test gypsum purity: 1. Determine SO3 and then divide by 0.8333 to get SO4, 2. Determine CaO and then divide by 1.4 to get Ca, 3. After checking that % SO4 x 40/96 = % Ca then: a. Add % SO4 and % Ca b. Divide by 4 to get theoretical LOI.
