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Soil, Sap & Tissue Analysis

Soil, Sap & Tissue Analysis

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Soil, Sap & Tissue Testing

Measure What Matters

Modern farming requires more than assumptions and blanket fertiliser programs. Soil, sap and tissue testing provide a scientific snapshot of what is happening beneath the soil surface and within the plant itself, allowing informed decisions that improve nutrient efficiency, profitability, plant health and quality yield potential.

At Downunder Ag, we utilise a combination of soil, sap and tissue analysis to understand both the soil environment and the crop's nutritional status throughout the growing season. Each testing method provides different information, and when used together they become powerful tools for improving agronomic outcomes.

Why Test?

Testing allows growers to:

  • Identify nutrient deficiencies and imbalances.

  • Improve fertiliser efficiency and reduce unnecessary inputs.

  • Monitor nutrient availability throughout the season.

  • Detect hidden deficiencies before visual symptoms appear.

  • Improve plant health, resilience and productivity.

  • Measure the effectiveness of nutrition programs.

  • Support biological activity and soil function.

  • Maximise return on investment from fertiliser applications.

Rather than guessing what a crop may need, testing provides measurable data that supports targeted decision-making.

Which Test Do I Need?

Soil Analysis

The expressSoil® with N-check® ES25 provides a foundation for understanding the chemical, physical and biological condition of your soil. It identifies nutrient reserves, pH, salinity, organic matter levels, cation balance and soil constraints that may affect crop performance.

Best used for:

  • Pre-season planning.

  • Developing fertiliser programs.

  • Understanding long-term soil health.

  • Identifying soil constraints.

  • Monitoring changes over time.

Detected nutrients:

  • Chloride

  • Phosphorus

  • Potassium

  • Magnesium

  • Sulphur

  • Calcium

  • Sodium

  • Zinc

  • Boron

  • Copper

  • Manganese

  • Iron

Sap Analysis

The NU-test® NU8 measures nutrients within the plant's transport system and provides a real-time picture of nutrient movement and availability.

Because sap testing identifies nutritional issues before they become visible, it is one of the most powerful tools available for proactive crop management.

Best used for:

  • In-season nutrition management.

  • Early deficiency detection.

  • Fine-tuning foliar nutrition programs.

  • Maximising nutrient efficiency.

  • Monitoring crop stress.

Detected nutrients:

  • Nitrate

  • Chloride

  • Ammonium

  • Phosphorus

  • Potassium

  • Magnesium

  • Sulphur

  • Calcium

  • Sodium

  • Zinc

  • Boron

  • Copper

  • Manganese

  • Iron

  • Molybdenum

  • Silicon

  • Aluminium

  • Brix (total sugars)

  • Sap pH

The NU-test® SapN add-on measures the total nitrogen in plant sap (Dumas method).  *Must be ordered with NU8 test.

Tissue Analysis

The Plant Response® PR73 measures the nutrients stored within plant leaves at a specific growth stage. It provides an indication of nutrient uptake and helps identify deficiencies or excesses.

Best used for:

  • Monitoring crop nutrition during the season.

  • Diagnosing nutrient deficiencies.

  • Benchmarking crop performance.

  • Assessing effectiveness of fertiliser applications.

Detected nutrients:

  • Nitrate

  • Chloride

  • Phosphorus

  • Potassium

  • Calcium

  • Magnesium

  • Sulphur

  • Zinc

  • Boron

  • Copper

  • Manganese

  • Iron

  • Sodium

  • Aluminium

  • Molybdenum

  • Total Nitrogen.

All results are reported in % or ppm of the dry weight of the sampled plant part.

After purchasing your required tests, please download the following Sample Collection Instructions and Soil, Sap & Tissue Order Form. Follow the steps carefully when collecting your samples and completing the order form. Downunder Ag will contact you with your results.

POST TO:

AgVita Analytical PO Box 188, Devonport TAS 7310.

Need help? Contact our team at Downunder Ag here for support.

DOWNLOADS

Sample Collection Instructions

Soil, Sap & Tissue Order Form

MORE INFORMATION

What is a xpressSoil® soil test?

What is a N-check® soil test?

What is a NU-test® sap test?

What is a Plant Response® tissue test?

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We’ve got you covered.

  • We have spent decades trialing cover crops, bio fertilisers and various seed mixes on our farm before we settled on what works. We’re not just seed distributors, rather farmers first and foremost.

  • Our seeds are untreated, weed free and grown in a regenerative system. Giving you full control over what you put into your soils.

    *Raddish treated with Thiram

  • We apply a seed primer bio-stimulant full of minerals, microbials & carbon to aid in germination. Giving you the confidence in a desired outcome.

  • Expert knowledge to help you make the right decisions. We have been working with customers Australia wide for a very long time, we know what works and what doesn’t and will help you get going.

  • We work with various shipping companies closely to ensure the right carrier is picked for your location and shipment.

What our customers say

  • “We have been working with Grant and the Down Under Covers team for nearly 2 years now and have been amazed by the results we are seeing ourselves. Grant’s knowledge and willingness to help has been phenomenal. The multi species equine mix Grant has helped us develop has given us hope and excitement for a truly regenerative future within thoroughbred horse industry. We are amazed at how the diversity has smothered the undesirables whilst attracting the beneficial insects”

    James Manning
    Godolphin

  • "Awesome people to deal with, they have everything you need for multi species crops to feed happy dairy cows"

    Maxi Vera
    Dairy Farmer

  • "Can’t stress enough how wonderfully the winter mix has gone for us over the last 4 years. We have just retrofitted our old combine to disc in the view of getting more covers sown next year!"

    Jess Conlan
    Victoria

  • "Great family business who work hard at providing a good product for a fair price."

    Greg Watkins
    Farmer

Cover Crop Education

Make sure to check out our education section to learn how to best implement a seed mix into your operation, how Grant and the team manage cover crops on their own farm, and discover answers to frequently asked questions.

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