LaMotte TL-2 Turf Lab Soil Test Kit - Manual (Page 4)

EX TRAC TION
The following method of extraction is used for obtaining the soil filtrate for the
tests for nitrogen, phosphorus, potassium, calcium, magnesium and iron. A
separate extraction is required for pH. Consult the LaMotte Soil Handbook for
information on sampling and preparation of the soil for testing.
Read the Demineralizer Bottle Instructions before proceeding.
NOTE:
The Single Test Procedure will give an adequate amount of soil extract
to do one test. The extraction procedure using 15 grams of soil should be used
when testing for more than one factor.
MUL TI PLE TEST PRO CE DURE
1. Use the 1 mL pipet (0354) to add 5 mL (5 x 1 mL) of the *Acid
Extracting Solution (6361) to the 100 mL graduated cylinder (0419).
Dilute to 75 mL with deionized water.
2. Pour this solution into the 100 mL bottle (0990).
3. Measure 15 g of the soil sample and add to the solution in the bottle. (Use
the plastic soil measure (1165) which is filled level full with the soil
sample.) Add 2 mL of Charcoal Suspension (5638). Cap and shake to mix
for 5 minutes.
4. Use the funnel (0465) and filter paper (0465) to filter solution. Collect
the soil filtrate in a 100 mL bottle. The soil filtrate is used for all of the
tests, except pH.
SIN GLE TEST PRO CE DURE
1. Use the 1 mL pipet (0354) to add 1 mL of the *Acid Extracting Solution
(6361) to the test tube (0701). Dilute to 15 mL line with deionized water.
2. Use the 1.0 g spoon (0697) to add 3 measures of soil.
3. Add 0.5 mL of Charcoal Suspension (5638). Cap and shake for 5 minutes.
4. Use the funnel (0465) and filter paper (0465) to filter solution. Collect
the soil filtrate in a 100 mL bottle. The soil filtrate is used for all of the
tests, except pH.
pH
1.
Fill a test tube (0106) to the 5 mL line with Tricon Flocculating Solution
(5941).
2. Use the 0.5 g spoon (0698) to add 3 measures of the soil sample. Stopper
the tube and gently mix by inverting the tube back and forth slowly for
one minute. Allow the soil particles to settle.
3. Use the pipet (0364) to transfer the clear solution above the soil to
another tube (0106). Fill second tube to the 25 mL line.
4. Add 6 drops of *Wide Range Indicator (2218). Cap and mix.
5. Insert test tube into the Octa-Slide Viewer (1100). Slide the pH Wide
Range Octa-Slide Bar (3424) into the Viewer. Match the sample color to a
color standard. Record as pH. If the sample color falls between two
standards, take the midpoint between the two standard values as the result.
NOTE:
Liming Tables are found on page 23 of the LaMotte Soil Handbook.
4