Predicting soil response to gypsum
Soils that are most likely to show economic responses to gypsum application have the following features in the topsoil, subsoil or both: high clay content—greater than 30%. particularly greater than 40%, high sodicity level—ESP greater than 5. particularly greater than 10, low salinity level—electrical conductivity of a 1:5 soil: water suspension (EC I:5) less than