Frequently Asked Questions
1. What does the Soil Testing Laboratory do?
We provide routine soil testing and fertilizer recommendations for
the purpose of evaluating soil fertility and soil pH level and/or problems
due to excessive salts or fertilizer materials
2. Will a soil test help diagnose problems with my plants?
Problems with plants may be caused by factors other than soil fertility,
e.g. disease, insects, insufficient light, soil moisture or compaction,
or climatic conditions. An evaluation of soil fertility and pH is an
important first step in diagnosing problems. If soil fertility is not
found to be a problem, then the other factors affecting plant growth
should be evaluated to determine possible causes (See #3).
3. Where can I go for more help?
Check out our Resources page for a complete
list of county and state organizations who can offer further help.
4. How long does it take for the Laboratory to analyze my samples?
It usually takes three to five days for the Laboratory to process your
soil samples.
5. Do you test homeowner soils for nitrogen?
Soils for home lawn, garden, trees and shrubs are not tested for nitrogen
because this nutrient is very mobile in soils. Therefore, the nitrogen
recommendation is based on plant type requirements and the relative
organic matter level in the soil as determined by the Laboratory.
6. Should I test for trace elements or lead?
Trace element tests may be useful in some professional operations for
special problems. Testing for lead is only useful if the soil is suspected
to be contaminated with lead.
7. When should I request the soluble salts test?
The soluble salts test is only necessary under specific conditions.
See -> soluble salts.
Soil Testing Lab, Rm. 135 Crops Research Bldg.,
1902 Dudley Ave, St Paul, MN 55108-6089
Email: soiltest@umn.edu,
Phone: 612 625-3101, FAX: 612 624-3420
Last updated:
October 22, 2007
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