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Garden Calculators

Use these handy garden calculator tools from the National Gardening Association to help you determine the quantity of materials you'll need for your gardening and landscaping projects.

What is limestone?

When gardeners talk about "lime" or "limestone," they mean either calcium carbonate (calcite or calcitic limestone), or calcium-magnesium carbonate (dolomite or dolomitic limestone) ... click here to read more.

What is sulfur?

... to lower your soil's pH, the best product is usually 100 percent finely ground sulfur, a mined mineral. Sometimes called "flowers of sulfur," this is the same material that gardeners use as a fungicide and is the material this calculator is based upon ... click here to read more.

What is "actual" nitrogen?

Recommendations for fertilizing lawns and other garden plants are commonly made in terms of "pounds of actual nitrogen."  The first of the three most prominent numbers on any bag of fertilizer is the percent of nitrogen in that product. A 100 pound bag of 10-10-10 contains 10 pounds of nitrogen (as well as 10 percent phosphoric acid and 10 percent soluble potash) ... click here to read more.

These calculator links are provided with permission courtesy of the National Gardening Association (NGA). NGA offers the Web's largest and most respected array of gardening content for consumers and educators, ranging from general information and publications to lessons and grants.