Macronutrient - Calcium (C) is an essential building block for plant cell walls and is involved in the transport and retention of other elements. It can also help to counteract the effects of alkaline salts and organic acids within the plant

Sources - This elements is most commonly found in dolomitic lime, gypsum and superphosphate fertilizer.

Note: We have provided some general information and observations on this topic aimed at the home gardener. Before you take any serious action in your landscape, check with your state's land grant university's Cooperative Extension Service for the most current, appropriate, localized recommendations.