The gains form gypsum: Not all can be explained, researchers say

摘要

More growers are using calcium-and sulfur-rich gypsum on alfalfa and other forages and row crops. Some have found that this soil amendment produces greener, leafier crops, gives faster regrowth, or that it improves soil structure. Others have discovered that it counteracts subsoil acidity or excess sodium. Scientific studies have backed up those benefit claims, says Malcolm Sumner. "But its not a miracle product," warns the former University of Georgia environmental soil scientist who has studied gypsum - calcium sulfate dihydrate - for 50 years. "It doesn't work everywhere."