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Despite propagation of the cassava crop be done by cuttings for commercial purposes, the majority of accesses keeps active the sexual propagation system; what is essential to genetic breeding programs. Cassava seeds, however, have low and uneven germination rates. Considering such event, the objective of this study was to evaluate the efficiency of the storage, and different pre-germination treatments, on cassava seedling emergence. For this, an experiment was carried out with seeds obtained by open pollination between plants of four sweet cassava cultivars, with 10 pre-germination treatments; in addition to a control treatment. The viability of seeds subjected to different treatments was assessed by tetrazolium test; and the assessment of seedling emergence was performed by daily counts of the number of emerged seedlings. Data obtained were expressed in: emergence percentage; emergence speed index; and mean time of seedling emergence. It was concluded that storage, at 4 °C, during one year, increases seed emergence percentage and favors cassava seedling emergence speed; and that the dry heat (60 oC), during seven and 14 days, also favors their emergence speed .

Pre-germination treatments and storage of cassava seeds and their correlation with emergence of seedlings