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International Seed Testing Association
International Seed Testing Association
Richtiarkade 18
8304 Wallisellen, CH
+41 44 838 60 00
ista.office@ista.ch
International Seed Testing Association

FAQ Purity Committee

Purity Testing

Request PSD: understanding of the 50% of Pure seed definition
ISTA Chapter 3
Reference 3.2.1 Pure seed
….
1. The following structures ………
1. Intact seed units
2. Pieces of seed units larger than one-half their original size.
Recommendation for action The basis is the size of the seeds, disregarding whether an embryo is present or not. The reason is the best possible uniformity in the application of this rule among ISTA labs. It is regarded as easy and clear for everybody to estimate the original size of a seed and then apply the 50% Rule. To decide about pieces of seed containing pieces of embryos and if they will germinate or not, will be less uniform from analyst to analyst. The agricultural value of broken seeds with/without embryo/pieces of embryo is then determined in the germination test.
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Purity Testing

  • PSD: understanding of the 50% of Pure seed definition
    ISTA Chapter 3
    Reference 3.2.1 Pure seed
    ….
    1. The following structures ………
    1. Intact seed units
    2. Pieces of seed units larger than one-half their original size.
    Recommendation for action The basis is the size of the seeds, disregarding whether an embryo is present or not. The reason is the best possible uniformity in the application of this rule among ISTA labs. It is regarded as easy and clear for everybody to estimate the original size of a seed and then apply the 50% Rule. To decide about pieces of seed containing pieces of embryos and if they will germinate or not, will be less uniform from analyst to analyst. The agricultural value of broken seeds with/without embryo/pieces of embryo is then determined in the germination test.

    Link List                       Link 1: Test

                                          Link 1: Test

                                          Link 1: Test

Purity Testing

  • PSD: understanding of the 50% of Pure seed definition

    ISTA Chapter: 3

    Reference:

    3.2.1 Pure seed
    ….
    1. The following structures ………
    1. Intact seed units
    2. Pieces of seed units larger than one-half their original size.

    Recommendation for action

    The basis is the size of the seeds, disregarding whether an embryo is present or not. The reason is the best possible uniformity in the application of this rule among ISTA labs. It is regarded as easy and clear for everybody to estimate the original size of a seed and then apply the 50% Rule. To decide about pieces of seed containing pieces of embryos and if they will germinate or not, will be less uniform from analyst to analyst. The agricultural value of broken seeds with/without embryo/pieces of embryo is then determined in the germination test.

    Link List

    Link 1: Test

    Link 1: Test

    Link 1: Test

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