pHusion KCS Plus 0-0-18 supplies five vital nutrients critical for proper soil chemistry - potassium, calcium, magnesium, sulfur and manganese. When soils are deficient in these nutrients, other primary and secondary nutrients can become unavailable which prevents the plant from efficiently utilizing the nutrients within the soil. Manganese acts as an enzyme to promote chlorophyll development. Manganese has can help reduce certain patch diseases in turf.