SUMMARY The growth and infection levels in mycorrhizalLavandula, LycopersicumandMedicagoplants were compared after treatment with preparations fromRhizobium, Azotobacterand phosphobacteria (aPseudomonas).The bacterial cultures are known to contain growth substances. Ceil‐free supernatants and in some instances, the whole bacterial culture, behaved as the pure plant hormone in improving dry weight and infection levels compared with mycorrhizal control plants.
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Azcón et al. (1978) studied this question.
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