By Sydne Moody
University of Georgia
With spring around the corner, many people’s thoughts revolve
around April showers and May flowers. But don’t let your garden
priorities get ahead of themselves. Before you do any planting,
you need to test the soil’s fertility.
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Gardeners and other planters can take advantage of a new
University of Georgia soil-testing method that provides faster
and more stable recommendations than was available in the past.
David Kissel, director of the UGA Agricultural and Environmental
Services Laboratories, developed the new soil test. The UGA Soil,
Plant and Water Laboratory began using it last November to
measure soil pH and make lime recommendations.
The new test, Kissel said, allows for better soil comparisons
from year to year and even within the same year.
This is important, he said, because if the soil’s pH isn’t at a
specific level, the plants can’t absorb the nutrients. No matter
how much you fertilize it, the plant still won’t grow well if the
pH level isn’t correct.
Sneaky pH
Some soils, such as the sandy soils of southeast Georgia, make
finding a pH level difficult, Kissel said. Accurate measurements
of soil pH are affected by field treatment and weather.
The new method, he said, uses a dilute salt solution to find the
pH, which causes less variation than the old method, which used a
distilled-water solution to find results. The use of the salt
solution counteracts the normal changes in salt levels from
fertilizers and rainfall.
“We needed to reduce the number of chemicals in the testing
procedures,” Kissel said of the new, environmentally friendly
test. No toxic chemicals are used in the new test.
Lots of work
The change from the previous soil test to the new one required
significant changes. The more than 200 crop codes all required
different element combinations.
“There were a lot of changes in information in the computer
system to prevent errors in the recommendations for the soil,”
Kissel said.
Because the new test uses a salt solution, the target pH for each
of the crop codes had to be adjusted. “We did it because it’s
better for farmers and clients who use our soil test,” Kissel
said.
Soil samples should be taken in the spring and fall, he said.
Last year, 90,000 samples were sent to the Athens, Ga., lab. A
routine soil test is a two-day process that costs $6.
“It’s relatively inexpensive for how important the information
is,” Kissel said.
(Sydne Moody is a student writer with the University of
Georgia College of Agricultural and Environmental Sciences.)
