Calcium is an important building block for plant cell walls. It also plays a key role in cell division and nitrogen uptake. According to the University of Wisconsin Extension, calcium makes up 3.6 percent of the Earth's crust and is usually quite abundant in most soils. Nevertheless, deficiencies may occur, particularly in garden soils with high acidity (low pH) levels and inadequate organic matter. Symptoms of calcium deficiency usually begin at new growth points, such as buds and roots.
Instructions
1. Test your soil before making any soil amendments. You can either buy a soil testing kit or take a sample in to your local University Extension office. Be sure to test both plant nutrient levels and soil pH levels, since calcium deficiencies are often related to low soil pH.
2. Analyze your soil test results. According to Clemson University Extension, if calcium levels are lower than 1,000 parts per million (ppm), your soil has low calcium levels.
3. Apply limestone if your soil has deficient calcium combined with low pH levels. Exact amounts will vary based on the types of plants in your garden and their maturity stages. Calcitic lime, or calcium carbonate, is composed of 40 percent calcium, and dolomitic lime contains 22 percent. Limestone is the most commonly used material for calcium deficiency.
4. Apply gypsum to your garden soil if the soil test results reveal optimum pH levels and deficient calcium. Gypsum contains 22 percent calcium and is especially beneficial for potato gardens. Once again, exact amounts will vary, so consult with a University Extension expert or your local nursery if you are unsure how much to apply.
5. Monitor soil and plants carefully after adding soil amendments. Test soil pH and calcium levels every few weeks and add additional amendments as necessary.
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