Soil test results affect fertilizer recommendations. The Soil Test module allows you to enter your soil test
Results. SMART!’s algorithm will analyze the results and will base the fertilizer recommendations on this
Soil lab - determines the set of extraction methods (analytical methods used by the laboratory to
determine nutrient levels in the soil) and the interpretation of each element level, using the specified
The default SMART! Soil Lab includes most of the available extraction methods.
Texture - select the soil texture.
Layer Depth - soil depth that represents the depth from which the sample was taken.
CEC - Cation Exchange Capacity of the soil in meq/100g units.
Bulk Density - bulk density of the soil in ton/m3.
OM – percent Organic Matter.
EC - measured Electrical Conductivity in ds/m.
pH - measured soil pH.
Average Temp. - average ambient temperature.
SAR - Sodium Absorption Ratio. This is a calculated value. When Ca, Mg and Na are measured in
the soil solution you can click the calculator button next to the SAR field. SAR will be calculated.
For each nutrient, select its ionic form, as indicated by your laboratory. Use the arrow next to the nutrient symbol, to open a drop box with available nutrient forms.
ppm = mg/kg, mg/l
cmol (+)/kg = meq/100g
Note that changing units will convert all values in the row to the selected unit.
SMART! instantly interprets the test results, as you enter them.
NOTE: In case that you cannot find the extraction method used by your laboratory in the Extraction Methods drop-down menu, or if the interpretation range and rating do not coincide with the information you have, you can easily add this information to your account. Contact Us and we will show you how.
if your laboratory indicated a test level of 1.5 mmol/L of K2O in a saturated soil paste, then:
In the Elements row, click the arrow next to K. A drop-box opens. and change K to K2O.
In the Extraction Method row, click the arrow next to extraction method under K2O and select Saturated Paste.
In the Test Results row, from the drop-box, select mmol/L.
Under K2O, Saturated Paste, enter the test result (1.5).