Studies show that additional Sulphur increases yield, particularly in coarse upland soils. Sulphur is the most widely used secondary nutrient. Plants require S as much of it as they require P. Sulphur is vital for plant growth, as well as protein and seed development. It is sometimes called as “the fourth macronutrient”.
Magnesium is a component of chlorophyll. Deficiency appears first as a yellowing of older, lower leafs.
Calcium stimulates the formation of roots and leaves, and is essential for cell wall formation.