Soil Sampling & Testing Advanced Soils Topics for Master Gardeners Amy Shober UF-IFAS Gulf Coast REC...
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Transcript of Soil Sampling & Testing Advanced Soils Topics for Master Gardeners Amy Shober UF-IFAS Gulf Coast REC...
![Page 1: Soil Sampling & Testing Advanced Soils Topics for Master Gardeners Amy Shober UF-IFAS Gulf Coast REC 1 of 13 ©2008 University of Florida-IFAS.](https://reader035.fdocuments.us/reader035/viewer/2022081519/56649da75503460f94a94097/html5/thumbnails/1.jpg)
Soil Sampling & Testing
Advanced Soils Topics for Master Gardeners
Amy ShoberUF-IFAS Gulf Coast REC
1 of 13©2008 University of Florida-IFAS
![Page 2: Soil Sampling & Testing Advanced Soils Topics for Master Gardeners Amy Shober UF-IFAS Gulf Coast REC 1 of 13 ©2008 University of Florida-IFAS.](https://reader035.fdocuments.us/reader035/viewer/2022081519/56649da75503460f94a94097/html5/thumbnails/2.jpg)
Tools for Collecting Soil
• Plastic bucket• Shovel or soil
probe• Paper bag or
newspaper for drying
• Soil test sample bag
2 of 13©2008 University of Florida-IFAS
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Taking a Soil Sample
• Representative area
• Sample the root zone depth
• Take & mix several cores together
• Do not mix cores from “good” & “bad” areas
3 of 13©2008 University of Florida-IFAS
Figure Credit: Amy Shober, UF-IFAS
![Page 4: Soil Sampling & Testing Advanced Soils Topics for Master Gardeners Amy Shober UF-IFAS Gulf Coast REC 1 of 13 ©2008 University of Florida-IFAS.](https://reader035.fdocuments.us/reader035/viewer/2022081519/56649da75503460f94a94097/html5/thumbnails/4.jpg)
ESTL RecommendationsTurfgrass Ornamentals/Vegetables
Bahiagrass Azaleas
Bermudagrass Blueberries
Carpetgrass Camellias
Centipedegrass Dooryard Citrus
Ryegrass Gardenia
St. Augustinegrass
Hibiscus
Zoysiagrass Ixora
Woody ornamentals (general)
Vegetables4 of 13
©2008 University of Florida-IFAS
![Page 5: Soil Sampling & Testing Advanced Soils Topics for Master Gardeners Amy Shober UF-IFAS Gulf Coast REC 1 of 13 ©2008 University of Florida-IFAS.](https://reader035.fdocuments.us/reader035/viewer/2022081519/56649da75503460f94a94097/html5/thumbnails/5.jpg)
UF-ESTL Available TestsTest A ($3.00)• pH• Lime requirement
Test B ($7.00)• Test A +• P, K, Mg
5 of 13©2008 University of Florida-IFAS
Photo Credit: Amy Shober, UF-IFAS
![Page 6: Soil Sampling & Testing Advanced Soils Topics for Master Gardeners Amy Shober UF-IFAS Gulf Coast REC 1 of 13 ©2008 University of Florida-IFAS.](https://reader035.fdocuments.us/reader035/viewer/2022081519/56649da75503460f94a94097/html5/thumbnails/6.jpg)
pH vs. Lime Requirement
Soil pH Test• Measures active acidity
– pH that affects plant growth
Lime Requirement Test
• Also called buffer pH• Measures reserve
acidity• Uses a liming solution• Compared to soil pH• Measures how easily
pH can be changed– Bigger change means
easier to change pH
6 of 13©2008 University of Florida-IFAS
Photo Credit: Amy Shober, UF-IFAS
![Page 7: Soil Sampling & Testing Advanced Soils Topics for Master Gardeners Amy Shober UF-IFAS Gulf Coast REC 1 of 13 ©2008 University of Florida-IFAS.](https://reader035.fdocuments.us/reader035/viewer/2022081519/56649da75503460f94a94097/html5/thumbnails/7.jpg)
Why Measure Buffer pH?
• Active acidity(solution) and reserve acidity (bound to clay and OM particles)
7 of 13©2008 University of Florida-IFAS
Figure Credit: James Bonczek, UF-IFAS
![Page 8: Soil Sampling & Testing Advanced Soils Topics for Master Gardeners Amy Shober UF-IFAS Gulf Coast REC 1 of 13 ©2008 University of Florida-IFAS.](https://reader035.fdocuments.us/reader035/viewer/2022081519/56649da75503460f94a94097/html5/thumbnails/8.jpg)
Why Measure Buffer pH?
• Lime (calcium carbonate) neutralizes acid in the soil solution & pH increases.
8 of 13©2008 University of Florida-IFAS
Figure Credit: James Bonczek, UF-IFAS
![Page 9: Soil Sampling & Testing Advanced Soils Topics for Master Gardeners Amy Shober UF-IFAS Gulf Coast REC 1 of 13 ©2008 University of Florida-IFAS.](https://reader035.fdocuments.us/reader035/viewer/2022081519/56649da75503460f94a94097/html5/thumbnails/9.jpg)
Why Measure Buffer pH?
• Ca2+ displaces H+ on the surface of clays or OM and pH drops back down.
9 of 13©2008 University of Florida-IFAS
Figure Credit: James Bonczek, UF-IFAS
![Page 10: Soil Sampling & Testing Advanced Soils Topics for Master Gardeners Amy Shober UF-IFAS Gulf Coast REC 1 of 13 ©2008 University of Florida-IFAS.](https://reader035.fdocuments.us/reader035/viewer/2022081519/56649da75503460f94a94097/html5/thumbnails/10.jpg)
Testing Soils for Plant Available Nutrients
• Chemical extractants are used• UF-IFAS uses the Mehlich 1
extractant– Developed by Dr. Adolph Mehlich (NC)– Good for P, K, Ca, Mg, Zn, Mn, and B– Good for acid, low fertility soils
• Nitrogen testing not available due to dynamic nature of N
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Soil Test Results
Soil Test Phosphorus (Lbs/Acre)
Rela
tive Y
ield
(%
)
0 20 40 60 80 100 120 140
0
20
40
60
80
100
L M Optimum High
$
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The Soil Test Report
12 of 13©2008 University of Florida-IFAS
Figure Credit: UF-IFAS Extension Soil Testing Lab
• Read the whole report!
• No lime recommended
• Recommendations (per 1000 sq. ft)– 2.3 lbs N
– 0.4 lbs P2O5
– 1.4 lbs K2O
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Summary
• Soils should be tested prior to applying fertilizers or lime.
• If you are planning to raise your soil pH, have a lime requirement test run.
• Soil samples can be analyzed by the University of Florida – IFAS Extension Soil Testing Lab (or other reputable lab).
• Always read the entire soil test report.13 of 13
©2008 University of Florida-IFAS