I'm wondering if anyone has some info on the relationship between calcium levels and dandelion populations. I know that dandelions grow good in soils that are low in calcium, are acidic and also that their deep tap roots bring calcium to the surface. Appearently, calcium deficiency is common in the east because the rain leaches it out of the topsoil. I was told that calcium should be present in quantities from 45 lbs/ 1000 sq ft to 184 lbs/ 1000 sq ft because it is so important. Calcium deficiency can be corrected by limestone (which makes soil less acidic) and gypsum (which makes the soil less basic). There are two main types of limestone - dolomitic and calcitic. Dolomitic contains magnesium as well as calcium. This kind should only be used if the soil test shows that magnesium is needed. My soil tests show the calcium levels but they don't show the optimum Ca levels for cool season grasses. I am having trouble determining how much to put down to bring Ca levels up the desire amount. I would like some more info on calcium if anyone is using it to correct soil conditions / fight weeds and I'm wondering If adding calcium will have an effect on the dandelion population (reducing it).