Purity Seed Analysis.

Our seed purity analysis test results let you know how much inert matter and other seed including weeds there are in your seed lot.

Seed Purity, along with Germination, is a critical factor affecting the value of seed. A Purity Test, following the ISTA or QDPI seed testing methods, indicates the proportion of “Pure Seed”, “Inert Matter” and “Other Seeds” within your seed sample. It’s important to test for seed purity to ensure your seed doesn’t devalue due to the presence of unwanted seeds.

Our seed purity test describes the Inert Matter and lists the Other Seeds by species and it is important to pay attention to these as these categories denote the composition of the seed lot. Inert Matter may contain live storage insects that may cause rapid deterioration of the seed lot, fungal bodies that could infect subsequent crops or other things that devalue the seed. Other Seeds may comprise other crop seeds or weed seeds, which may be noxious or an unwelcome addition to your farming system.   

Purity Seed Analysis - AgEtal

About the Analysis

  • ISTA testing is testing according to ISTA methods. We can test Purity, Other Seed Determination, Germination and Thousand Seed Weight.
  • A Seed Purity Test tells you what there is other than seed, which may be harmful or undesirable in your farming operations.
  • Other Seed Determination examines your sample for seeds other than the target seed.
  • Germination testing estimates what percentage of your seed lot is able to germinate.
  • Thousand seed weight calculates how much a thousand seeds should weigh, giving an indication of size and density.

Factors affecting results

Factors that could affect the results of a Seed Germination Test:

  • Grading vs off the header
  • Mechanical damage
  • Pest infestation (Insect and rodent) 

Quantity required

 Quantity required: 

  •  For larger seeds (wheat and larger) the required amount for a Purity Test is 1Kg. For fine seeds we usually ask for a cup full.
  • For light chaffy seeds we need a shopping bag full. This can be used a guide only.  Please refer to our Sampling page.

Other recommended tests

Other analysis that may be carried out to augment and add value to Purity Tests:

  • Germination
  • Vigour
  • Tetrazolium
  • Moisture
  • Seed Count

Ready to get started?  Request for Purity Seed Analysis

Would you prefer to Print or Download this form?

If you would prefer not to complete this form online, you can download or print the form.

Simply complete the form on paper, attach to your sample and post or deliver to AgEtal.

If you require testing to full ISTA methods (i.e. 4 reps instead of 2) or for OIC/BIC please use the ISTA form.

Download ISTA Form

Request for Analysis FormNew Customer Form

Accurate results
in a timely manner.


Request for Analysis.

Simply book online for all your seed and grain testing then drop off or post the sample to our lab.

Please be sure about the tests you require before submitting your Request for Analysis. *See our Cancellation Policy
Test results have a fast turnaround and are available online.

Request for your samples to be analysed in three easy steps.

Complete the
form below.
Sign & attach the receipt
to your sample.
Post or deliver the
sample to AgEtal.

Attach the form to your sample. Post or deliver the sample to AgEtal. For fast turnaround, please deliver samples before 3:30pm.

Thank you for requesting an analysis

We have received your request for analysis, don't forget to print and sign the receipt below to attach to your samples. Send or deliver your samples to our laboratory. If you have any questions, please contact us.

We will be in contact with you when your results are ready.

Print Receipt

Attach the form to your sample. Post or deliver the sample to AgEtal.

AgEtal Request Analysis

Customer Details
Accounts Payable Details
Analysis Details 1
Lab. No. (Office use only)
Analysis Details 2
Lab. No. (Office use only)
Analysis Details 3
Lab. No. (Office use only)
Analysis Details 4
Lab. No. (Office use only)
Analysis Details 5
Lab. No. (Office use only)
Analysis Details 6
Lab. No. (Office use only)
Analysis Details 7
Lab. No. (Office use only)
Analysis Details 8
Lab. No. (Office use only)
Accredited Sampler & Other

* Abbreviations: Purity = P  Germination = G  Vigour = V  Tetrazolium = Tz  |  Weed Search = WS

A booking receipt will generate when submiting this form. (a confirmation will sent to the nominated Customer email)

Test results have a fast turnaround and are available online.

Please remember to complete the final steps when you submit this form.

Sign & attach the receipt
to your sample.

(Booking Receipt)
 Post or deliver the
sample to AgEtal.

Export Information (if applicable)
Analysis Submit
Issued by Luanne Cunliffe Director Webform WAM03 01/09/21

Contact AgEtal Agricultural Testing Laboratory

Get in contact with our laboratory to book an analysis or learn more about our testing.

Phone 07 4633 3223

Courier 9/24 Carroll St Toowoomba QLD 4350

Auspost PO Box 7135 Toowoomba South 4350

Opening Hours

Monday to Friday
8:30am to 5:00pm

Saturday & Sunday
Closed to the public

Counting is done every day – after hours drop off box available.

Follow us on Social Media



Send a message

Need some more information about the laboratory services we provide, have a technical question, feedback or want to discuss an idea with us?

Select a form and forward your message. 

General Enquiry

AgEtal Contact

Send a message

Technical Questions

Agetal - Technical Questions

Technical Questions

Customer Feedback

Agetal - Customer Feedback

Customer Feedback

Subscribe to our mailing list

* indicates required