A Warm Germination Test (WGT) helps indicate seed viability by determining the seed’s ability to germinate under ideal growing conditions. The WGT result is required by law to be included on seed labeling and is generally valid for up to 6 months. The results of this test are comparable across seed providers because the testing methods are standardized through regulation and are consistent from company to company.
A Cool Germination Test (CGT) helps indicate seed vigor by testing the ability of the seed to germinate in less than ideal conditions. This test is not required by law and is not comparable across seed companies as testing methods are not standardized. Bayer rigorously follows the suggested testing guidelines outlined in the Association of Official Seed Analysts (AOSA) Vigor Testing Handbook for conducting the Cotton CGT. The WGT and CGT are only two components of our quality management system used to provide the highest quality seed.
Bayer takes a lot of pride in providing farmers with the best quality product. Our internal standard minimum WGT percentage for cotton seed is 80%, and a minimum score of 60% is used for the CGT. However, in years where the environment impacts seed quality, we may sell cotton seed with lower scores, considering all quality factors that may affect the grower’s experience. Bags tagged below standard go through a review process before being released for sale.
Yes. WGT scores are printed on every bag or box of seed sold, and growers can submit the seed batch numbers through their retailer to receive CGT scores.
Yes. Each lot of cotton seed is tested for several quality parameters. All incoming bulk seed is tested for moisture, maturity, and free fatty acid level prior to being accepted, and both bulk and finished batches of seed are tested for visual mechanical damage.
1 Edmisten, K. 2018. Cotton seed quality and planting decisions. NC State Extension. 2018 Cotton Information. https://content.ces.ncsu.edu/.
2 How deep should I plant cotton seed? 2007. eXtension. http://www.extension.org/.
3 Boman, R., and Lemon, R. 2005. Soil temperatures for cotton planting. Texas A&M Cooperative Extension. SCS-2005-17. http://cotton.tamu.edu/.