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and 'ater are thoroughl( mixed
2 Stir the soil3'ater mixture &or 2, seconds e-er( 2 minutes
&or a total o& &i-e stirring4'aiting c(cles 5hen$
allo'
the mixture to settle until a supernatant /clearer li6uid a"o-e
the settled soil &orms /a"out 7 minutes
+ 8easure the p% o& the supernatant using the p% paper$ pen$
or meter
Place the "ottom o& the p% pen in the Supernatant
/clearer li6uid a"o-e the settled soil
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The pH of this soil is 6.5
7 Repeat steps 13+ &or each sample &rom each soil
hori9on$ and record (our results on the Soil p% )ata
:or#sheet
Soil Fertility
Soils that ha-e cla( particles and organic matter usuall( ha-e a
negati-e charge
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Part 1: Preparation and Extraction
1 Fill the extraction tu"e &rom (our Soil 5est ;it to the 2,
m. line 'ith distilled 'ater
* Add * Floc3Ex ta"lets Cap the tu"e and mix 'ell until "oth
ta"lets ha-e disintegrated
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2 Remo-e the cap and add one heaping spoon&ul o& dr($
sie-ed soil
+ Cap the tu"e and sha#e &or one minute
7 .et the tu"e stand until the soil settles out /usuall( a"out 7
minutes 5he clear solution a"o-e the soil 'ill "e
used &or the nitrate /N$ phosphorus /P$ and potassium /;
tests
ote0 For some soils$ especiall( those 'ith a high cla( content$
there ma( not "e enough clear solution extracted!& more clear
solution is needed$ repeat steps 137
Part !: itrate itro"en #$
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7 Compare the "lue color o& the solution to Phosphorus on
the color chart in the Soil 5est ;it Record (our results
/%igh$ 8edium$ .o'$ or None on the Soil Fertilit( )ata
:or#sheet
= )iscard the solution and 'ash the tu"e and the pipette 'ith
distilled 'ater
> Repeat this procedure 'ith the li6uid &rom each o&
the soil samples Be sure to rinse the pipette and tu"e 'ith
distilled 'ater a&ter the( are used
Part &: Potassium #'$
1
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results /%igh$ 8edium$ .o'$ or None on the Soil Fertilit( )ata
:or# Sheet
+ )iscard the solution and 'ash the tu"e and the pipette 'ith
distilled 'ater
7 Repeat this procedure 'ith the li6uid &rom each o& the
soil samples Be sure to rinse the pipette and tu"e 'ith
distilled 'ater a&ter the( are used
Continue to Part > o& the Step3"(3Step Guide0 Soil
Particle )ensit(
http://soil.gsfc.nasa.gov/index.php?section=124http://soil.gsfc.nasa.gov/index.php?section=124
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