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California Crop Improvement Association
California Crop Improvement Association
California Crop Improvement Association
University of California
California Crop Improvement Association

Seed Testing

Section 20. Seed Testing

Return to General Standards Table of Contents

To be eligible for certification, each lot must be tested and meet minimum seed inspection standards established for each crop and described in individual Crop Standards. The seed from a field which has passed field inspection must be tested for purity (both physical purity and varietal purity) and germination. In many instances varietal identity cannot be determined by visual seed inspections, though tests exist for certain crops (such as Red Rice Rubout and contrasting kernel color in wheat). In addition, some crop kinds require special tests such as presence of dodder or Ascochyta Blight (see individual Crop Standards). The size of  the representative sample submitted for seed analysis from each lot is  identified in each crop standard (refer to Section 19 Sampling).  Seed must be tested in accordance with the Association of Official Seed  Analysts (AOSA) rules for testing seeds. 

In addition to  meeting the requirements for germination and purity, each lot of seed must be  well screened and graded, bright in color and otherwise of good appearance. If  the sample meets the required standards, a Seed Inspection Report will be issued to  the applicant granting certification based on the sample tested. Certification  may be maintained on a lot of seed only as long as subsequent tests for  labeling data indicate that the seed meets or exceeds the standards for that  crop seed (see Crop Standards). If a lot of certified seed is sampled for Seed Law  enforcement purposes, and the sample is found to be out of tolerance with the  minimum certification standards, the lot will lose its certification.

Go to Section 21. Seed Certification

Updated: May 2017

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