Listed by the Organic Materials Review Institute for use in organic production.
Performing a complete soil analysis or using a home soil test kit before application is recommended. Soil testing services will provide guidelines for the efficient application of all fertilizers and soil amendments. Soil texture reports can help identify problems and inform appropriate application rate amounts for improving soil physical characteristics. Gypsum is neutral in ph and will not affect soil acidity. In the absence of a soil analysis, use the recommended rates below.