— Germination tests and pot experiments were carried out to study the specificity between an Azospirillum lipoferum strain and Zea mays hybrids. In both types of trial differences between hybrids were exhibited, and the in- fluence of the plant genotype was clearly demonstrated. The optimal level for bacterial concentration was found to be 10 7 bacteria per plant and the importance of an early inoculation was shown. Pot experiments were less precise than germination tests. Such germination tests for screening plant varieties using the criterion of plant-growth promotion appeared to be a very useful tool.
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Arsac et al. (1990) studied this question.
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