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Calcium plays a very important role as a nutrient in regulating plant growth and development and must be available for uptake from the soil or other growing media. Several soil characteristics affect the availability of calcium to plants: soils with higher pH have higher levels of available calcium than acidic (lower-pH) soils; soils with a higher capacity to absorb or hold calcium will have more available calcium; the presence of excessive amounts of sodium, potassium, or magnesium in the soil interferes with calcium availability. Calcium can also react with other soil nutrients, such as phosphorus, to form insoluble compounds that cannot be used by plants. Calcium is commonly applied as a soil amendment in the form of ground limestone (calcium carbonate) or gypsum (calcium sulfate) (Hodges 2010). Water-soluble calcium (WCA) is an alternative to these commercial sources of calcium. This fact sheet addresses frequently asked questions about making WCA and its use in Natural Farming https://cdn.shopify.com/s/files/1/0506/8629/6244/files/water_souable_calcium.pdf?v=1648495541