One item many gardeners fell to add to soil is lime.
Lime increases the pH of soil. The soil pH strongly influences plant growth, availability of nutrients and the activity of soil microbes.
Garden soil falls into one of three broad categories:
2. Neutral; or
On the pH scale, which goes from zero to 14, seven is defined as neutral (neither acidic nor alkaline), below seven is acidic and above seven is alkaline.
Each unit change in the scale represents a 10-fold change in acidity or alkalinity. For example, a pH of 5.0 is 10 times more acid than a pH of 6.0.
Many gardeners know that productivity of the vegetable garden decreases as the pH falls from the range of 6.2 to 5.5 and below. Plants may not die, but their rate of growth is slower and the amount of fruit is decreased.
Over a period of time, gardens tend to become more acidic. Rainfall, irrigation, soil erosion, crop removal and the use of the ammonium form of nitrogen all contribute to a gradual lowering of the pH. Routine applications of liming materials will prevent and/or correct low soil pH.
The amount of lime to apply should be determined by a routine soil test. Liming recommendations indicate the number of pounds of lime needed to bring your garden pH up to the satisfactory range for vegetable production.
As a general rule of thumb, a pH in the range of 6.0 - 6.2 is best for growth of vegetables. Usually around 50 pounds of lime will be required for each 1,000 square feet of garden; however, the exact rate will vary depending on soil type, fertilization practices and previous liming history.
There are a number of different types of liming materials available. Most liming materials, in addition to neutralizing soil acidity, also supply calcium and/or magnesium. The most common liming material used in Georgia gardens is dolomitic limestone. Dolomitic limestone sold in Georgia contains more than 6 percent elemental magnesium in addition to calcium. Since Georgia soils are often deficient in magnesium, dolomitic limestone is usually recommended.
In order to determine if your lawn or garden soil needs lime, you may contact the Dawson County Extension Office at (706) 265-2442.
The local extension office will send your soil to the University of Georgia Soil Test Lab in order to determine the pH of your soil.
Clark Beusse is the Dawson County extension agent. For more information, call (706)265-2442.