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Seed testing procedures are entered in individual seed analysis cards. Working sample of specified size is obtained from the submitted sample by using the seed dividers. Physical purity analysis: The purity analysis is done on a working sample of prescribed weight drawn from the submitted sample.
A tetrazolium or TZ test is a common laboratory technique used to determine seed viability. During a TZ test, imbibed seeds are placed in a solution and respiring tissues stain red while non-respiring tissues remain partially stained or unstained.
SEED TESTING. The main objective of seed testing is to assess the actual planting value of the seed in terms of its germination capacity besides determination of percentage composition of the pure seeds, weed seeds, other crop species, extraneous matter and moisture content of the submitted sample.
Seeds are placed on one or more layers of moist filter paper or blotter paper in petriplates. These petriplates are covered with lid and placed inside the germination cabinet. This is suitable for those seeds which require light. The seeds are germinated between two layers of paper.
Physical purity testing refers to the analysis for classifying the composition of a seed lot. It is important for evaluating whether the given seed sample conforms to the prescribed purity standards; and whether it can truly represent the seed lot. Ideally, the working sample should roughly contain at least 2500 seeds.
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A germination test uses a small sample of your seeds to check how viable the rest are, simply by trying to sprout them ahead of time and seeing how many germinate. A germination test is the only meaningful measurement of seed viability, since it doesnt really matter how old the seeds are.
Standard Industry Seed Quality Testing Germination and physical purity are both required to be visible on bag tags. Genetic purity testing ensures genetic purity and trait purity expression are meeting product specifications. Genetic purity results of less than 95% require bag tag labeling to be referred to as a blend.
The laboratorys results become the basis upon which to determine whether or not seed has been properly labelled and is being sold in ance with the Seed Act requirements. The seed testing laboratorys results have a legal validity and form the basis on which the Seed Act to implement.

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