CALCIUM MAGNESIUM SULPHATE(CMS) Secondary nutrients Calcium (Ca) Magnesium (Mg) and Sulphur (S) though needed in small quantities are very significant in plant growth and attribute to higher yield. BENEFITS: (1) Regulates pH. (2) Provides secondary elements. (3) Improves root development. (4) Improves soil structure and texture. (5) Helps in uptake of nutrients. (6) Improves microbial activity.