Calcium Sulphate Soil Conditioner is best known for improving soil structure, increasing aeration and infiltration, and it reduces nutrient runoff and soil erosion. The benefits to the soil are long and detailed. And naturally when you improve the soil, you also improve the growing conditions for plants. In addition, it is also a natural source of calcium and sulfur for plant nutrition, both of which are secondary macronutrients. Plants need as many as 15 nutrients in addition to water, carbon dioxide and oxygen. These are broken into three groups including primary macronutrients that include nitrogen, phosphorus and potassium; the secondary macronutrients calcium, magnesium and sulfur; and finally the micronutrients boron, chloride, copper, iron, manganese, molybdenum, nickel and zinc.