Methods of comparing germination curves are described and these are discussed in relation to the problem under consideration. In a study of chemical factors which modify seed germina-tion (here all inhibitory), the changes in the rate of germination appeared to be associated with the inhibitory factors. These curves could be adequately described by orthogonal polynomial regressions. It is noted that some coefficients devised to represent the course of germination were not adequate for these purposes The reasons are discussed.
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Goodchild et al. (1971) studied this question.
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