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as with storage, incubators should be used if they can be properly operated and maintained. many new techniques are being developed to measure such characteristics as embryo development, vigour, etc. a range of rules and regulations are available which build on experience with agricultural seed, and can be used for certifying seed quality. the international seed testing association (ista) is one of the best sources for information on seed analysis. see finding out more - selected references - analysis for further information on techniques. see finding out more - organizations - ista for their information. seeds may need to be treated in a variety of ways to improve storage, germination or survival in the nursery or field.