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Take the guesswork out of
remineralizing your soil

OrganiCalc: Logan Labs soil test interpretation

Convert a test report into a list of recommended amendments

All recommended amendments are approved for organic use

Eliminates math errors

Trusted by soil analysts worldwide

Logan Labs Soil Test InterpretationLogan Labs Soil Test Interpretation

DIY Logan Labs soil test interpretation.

OrganiCalc converts a Logan Labs soil test report into a list of soil amendments approved for organic use. The recommended amendments remineralize soil and provide a plentiful reserve of balanced minerals to help grow healthy plants and healthy people. It creates an ideal mineral recipe for your unique soil.

OrganiCalc has delivered thousands of soil amendment recommendations to the inbox of organic farmers and gardeners. It is an important tool for growing healthy nutrient-rich crops.

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Included with a one year subscription
OrganiCalc for VegetablesOrganiCalc Pro
Designed for Logan Labs std soil test reports - Std M3, AA, AA8.2, extras, BFA Ag-dyn3
Analyze as many soil test reports as you care to
Trusted algorithm for choosing amendments
Recommendations for vegetablesDefault
Recommendations for only OMRI organic amendmentsDefault
Error checks for typos
Adjusts for sample depths other than 6"
Adjusts for area to be amended
Adjusts for depth to dig in amendments
Choice of US or metric units
Choice of Nitrogen target
Choice of 2 N-P-K fertilizers with "best fit" N-P-K hint
One custom N-P-K fertilizer
Choice of cation targets for sand, clay or loamDefault
Edit Ca, Mg, K and Na % saturation targets
Enter up to 6 custom carbon-based N-P-K fertilizers
C:N ratio of amendments calculated
Choice of P, S, B, Fe, Mn, Cu and Zn targets
All mineral amendments may be customized
Form remembers last entries
Required for commercial customers
Access to Soil Analyst forum
Watch a demo

The right minerals can make all the difference

I was mineralizing a row of broccoli and ran out before the end of the row. The one on the right missed getting boron, gypsum and feather meal.

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Frequently Asked Questions
Lab tests are not all the same. Other labs use different testing methodologies, even if they do a Mehlich 3 or AA test. OrganiCalc works best with Logan Labs soil tests

You can order Logan Labs soil tests on our website, here.

OrganiCalc is designed to be an aid in growing nutrient dense food, however it is not applicable for certain circumstances.

Acid soil loving crops

If you are growing blueberries, rhododendrons, potatoes or other such plants, the recommendations are good, as long as the pH is low enough. Just don’t add the lime or manganese OrganiCalc recommends.

Pastures

These recommendations are for growing nutrient dense food, not for pasture. Aside from the expense of bringing large areas up to these levels, herbivores are very sensitive to changes in taste. Mineral application limits are much lower for pastures. Consult an analyst experienced in pasture management. Contact Erica@GrowAbundant.com, and we will share what we have learned about pasture management.

Your soil is already balanced

Usually this happens after a few years of soil mineralization. Your soil settles to a point where the plants are growing very well. You don’t want to disturb this equilibrium, or lose valuable (cation) nutrients. You want to add only enough of the anion nutrients to grow a good crop: nitrogen, sulfate-sulfur and boron.

When your soil is mineral-balanced, it’s time to really focus on the biology.  5% organic matter is a nice number where summer is hot; 8 to 9 % is a good number where summers are coolish, such as in the Maritime northwest. Organic matter over 30% is more than enough.

Finally, if your soil is otherwise balanced and you have excess Ca, don’t try to fix it; leave it alone.

Yes. OrganiCalc for Vegetables allows you to adjust the nitrogen target. OrganiCalc Pro allows you to adjust all of the mineral targets in order to tailor the report for any crop.
Some amendments need to be dug in because the minerals are not mobile in the soil. Phosphorus in particular is not mobile in the soil. If phosphorus cannot be dug in, it is best to soil apply it in liquid form as high P fish hydrolysate (usually 2-4-1 or 2-3-1), every 7 – 10 days, especially when plants are young and rapidly growing.

The table on this page shows the mobility of minerals in their elemental form; they are all mobile in their sulfate forms, especially when applied with water. So, if you need zinc (which is immobile in the soil), you can dissolve it in water (as much as you can) and apply it during a rain event. It will penetrate to the depth of the water. The same is true for copper and iron.

OrganiCalc Pro allows you to change the list of amendments it selects from, and remembers the changes until the form is reset.  Alternatively you can use this form to convert a single amendment.

*Note that OrganiCalc is designed to prevent excesses of any nutrient in the soil and will not recommend an amendment containing a element that is already sufficient in the soil. So if your bag of XYZ contains magnesium and your soil already has sufficient magnesium, OrganiCalc will not recommend it.

If it isn't in your soil, it won't be in your food.

Get a soil test from Logan Labs. Enter it into OrganiCalc, for DIY Logan Labs soil test interpretation. Assemble the recommended amendments. Add the amendments to your soil. Grow delicious, nutrient dense food.

Subscribe to OrganiCalc Pro
If you have ever had a subscription to OrganiCalc or OrganiCalc Pro, log in.

or subscribe with a different email address.

Note: This is for a one time subscription. You will receive a reminder email to renew.

Go to Checkout

Subscribe to OrganiCalc for Vegetables
If you have ever had a subscription to OrganiCalc or OrganiCalc Pro, log in.

or subscribe with a different email address.

Note: This is for a one time subscription. You will receive a reminder email to renew.

Go to Checkout

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