Measure More Than Just Nutrients

Deploy our Soil Health & Nutrient Audit and see a bigger picture

In 1988 Woods End started offering a comprehensive “Soil Quality Audit”, combining  physical, biological and nutrient tests in a single integrated report. This was very likely the first test offering in the USA for what today is popularly called “soil health analysis”.

Soil health is a challenge to soil labs since it is a quality which doesn’t come from one or even a few properties. Rather it emerges from the interaction of many. And the interactions vary across climate zone and soil types. That’s why we’ve designed a robust lab process that integrates your “eco-physiography” – soil identification, rainfall and climate – into the evaluation.

Overall, the results bring together both quantitative and qualitative factors that relate to healthy functioning. Added to that, we’ve accounted for careful and specific soil handling, understanding that the manner in which soils are processed before and during testing also greatly influences the results.


Cornerstones of How We Do It:

  1. We identify your place – we believe a soil health report can’t be interpreted without knowing the actual location. You’ll see SSURGO soil classes appear on your report along with the national eco-zone designation!
  2. We use biological assays – innovative tools evaluate such critical soil health factors as microbial carbon respiration (a test our lab has 40 years of experience with) and accumulation of amino nitrogen indicating the quality of humus and favorable crop-rotations.
  3. We include bio-physical traits – our water-stable aggregate (“VAST”) method enables exciting visual and quantitative evaluation of erosion-sensitivity and soil-porosity that is due to microbial and plant presence.
  4. We minimize sample disturbance – no grinders or mills are used which disrupt bio-physical features relevant to soil biological tests. We’ve revived soil rolling, a traditional art once used to prep soils but unfortunately discontinued due to modernization of labs.

 1- Premium Soil Health Test

  • Evaluates quality and not just quantity of soil organic matter.
  • Accounts for soil microbial biomass via respiration instead of indirect chemical measures;
  • Evaluates nutrient mineralization potential, the core of the nutrient supply mechanism for plants
  • Represents nutrients likely to be “plant relevant” from lighter-weight extractants
  • NEW in 2020: you can choose between Organic Matter or Total Carbon – or add Total Carbon to your Premium!

2- Basic Soil Health

  • Our basic soil health test is meant to be a companion to common soil nutrient analyses obtained elsewhere or through your favorite soil lab. The basic adds information about biological and bio-physical traits that are not available elsewhere.  Included is Solvita CO2, SLAN, Water Stable Aggregates, Water soluble carbon (WSOC), Soil C:N ratio, and Respiratory Quotient.

With every soil sample, you will receive a full-page report giving a Fertility Score and a Soil Health Score, along with a 4-page interpretation guideline explaining the test concepts and the ranges expected.
The Soil Health Score weighs multiple attributes associated with biological functioning in soils, while the Fertility Score integrates this with the nutrient status.  Why do this? Because we know you can have a healthy soil with deficient nutrients, or you can have a nutrient-rich soil which is in poor health. This helps you better understand your situation and helps us make better suggestions for you.

Here’s just a few unique features of our report:

  • Nitrogen-mineralization estimation – we combine biological tests and climate zone ranking to give you a realistic estimate of the amount of N your soil will contribute without fertilizer.
  • Likelihood of N-response – this is a special test that we’ve developed which estimates the probability that your crop will respond to added nitrogen. This helps inform your decisions and potentially save money on N.
  • Soil phosphorus equilibrium – in addition to showing your reserve phosphorus (Mehlich-1) we offer a unique test coming from Europe that shows your soil’s ability to push phosphorus from fixed into available form. Think of it as likelihood of P-response, a test that may help save unnecessary P-fertilization and cost.
  • Cation Balance – If you grow covers crops and are grazing animals, excessive potassium can be a serious risk – we show the molecular balance of K: (Ca+Mg) to guide you here.

Please provide the following:

  1. The soil sample: (wet or dry) in a quart sized ziplock bag, with the date of the sample and the intended crops.  If the location is different than the zip code on the order, please provide specific GPS or sample zip code information which we use to map to your climate zone.
  2. Sample Information Form: Please attach the following Sample-information with each order.