Soil (and Nutrition!) Math and Glossary 101
TEC - Total Exchange Capacity - Of all particles and receptor sites in a mix, a value which demonstrates the size and ability to retain or make available cations and anions.
Cations - Elements or ions, of which the net result is a positive charge.
Anions - Elements or ions, of which the net result is a negative charge.
CEC - Cation Exchange Capacity - "The total capacity of a soil to hold exchangeable cations. It influences the soil's ability to hold onto essential nutrients and provides a buffer against soil acidification."
EC - Electrical Conductivity (measured in micro-siemens, µS/cm, "measure of the concentration of dissolved solids which have been ionized in a polar solution *cough* water")
ppm/ppb - Parts per million/billion
mEq - milli-equivalents/(typically of 100 grams of soil or mix content)
Bulk Density = mass of dried soil per volume of that soil when field ready (dry weight of the soil and divide by total volume). Usually expressed in grams per cubic centimeter. - biggreg
Percent Nutrient Saturation - Each elements individual presence in the TEC
Percent Base Saturation - The sum of a groups (Ca ++, Mg ++, K+, Na+, H+, [sometimes Fe ++, Zn ++, Cu ++, Mn++, Al +++]) percentage or presence as cation's
in the TEC
M3 - Melich 3 testing method- an extractant which when combined with soil samples will separate elements from each other and organic material to determine nutrient saturation.
AA @ 8.2 - Ammonium Acetate/pH 8.2 testing method -an extractant used to determine nutrient saturation which does not overestimate Ca++ content, which M3 may.
For all links, Change to http - (remove 's')
Calculating Base Saturation
- I'll put it in my own words someday but for now, the Midwest link will do nicely.
Calculating PPM and percentages for a specific nutrient/product (example/starting point is Agsil 16) ~Avenger
Examine your label
Silica (SiO2)…………. 53%
52.8 (53% as listed by AgSil) times ten equals 528 ppm from one gram Agsil 16h in one liter final volume solution
divide 528 by 3.785 and you get 139.5 ppm of SiO2 in one gallon final volume solution from one gram Agsil 16h
[A total molar mass of SiO2 is 60.0843 or Si (28.0855) + O2 (31.9988)]
SiO2 is [sic]therefore: 46.75% silicon(Si): 53.25 oxygen (O), so ...
139.5 times 0.4675= 65.22 ppm silicon (Si) from one gram Agsil 16h in one gallon final volume solution.
65.22 x 0.7 = 45.7 ppm Silicon from 0.7 grams in one gallon final volume
65.22 x 1.25= 81.5 ppm Silicon from 1.25 grams in one gallon final volume
((the solubility limit is ~120 ppm SiO2[~56 ppm Si]))
PPM, Dilution, Concentration, Molarity: https://delloyd.50megs.com/ppm.html
Solubility Limits Table and tutorial: https://www.ausetute.com.au/soltable.html
Solubility Limits Table (exhaustive): https://en.wikipedia.org/wiki/Solubility_table
Concentration/Percentage Converter: https://www.endmemo.com/convert/conc...percentage.php
[e.g. SiO2 at .012 g/100ml = 120ppm]
Additional Equations and Circumstances: Bulk Density and Conversions
Practice Problems/Equations: Porosity and Bulk Density: https://lawr.ucdavis.edu/classes/SSC...ts/pset01.html
Molecular Mass Calculator: https://www.convertunits.com/molarmass/
Volume Conversion Calculator: https://www.endmemo.com/convert/volume.php
Area Conversion Calculator: https://www.endmemo.com/convert/area.php
Cubic Yard Calculator and Tables (scroll down):(1) https://www.harvestpower.com/product...pe-calculator/
(lesser used) Cubic Ft. to Sq. Ft.: https://www.endmemo.com/cconvert/ft3ft2.php
I'll edit often and tidy up. Any resources or links that should be easily accessible will be included.
Capacities of common substrates: https://www.extension.uidaho.edu/nur...CN%20ratio.PDF
Organic Soil vs. Mineral Soil: https://www.icmag.com/ic/attachment....9&d=1480837564
Biology and FAQ: https://content.ces.ncsu.edu/extensi...n_heading_7243
Measuring Moisture Content in Leaves and Compost: https://compost.css.cornell.edu/calc...e_content.html
The difference between M3 and AA testing (The USGA article): https://gsrpdf.lib.msu.edu/ticpdf.py...oil-3-4-11.pdf
Tiedjens, Albrecht, and more: https://soilanalyst.org/category/authors/
Further Reading: https://soilanalyst.org/category/textbooks/