Effects of seed treatment on the emergence of wheat and barley at two sowing depths

Abstract

Two experiments (wheat and barley) were carried out in 1990 in a Dark-Red Latosol, clay texture, in Planaltina, DF, Brazil. The treatments considered two depths (5.0 and 8.0 cm) and three seed treatments: without any fungicide as check with triadimenol, and with thiran. Both fungicides were applied on two wheat cultivars (BR 12 and BR 16) and on two barley lines (L 8023 and L 8299). Wheat experiment: no effect was observed for the seed treatments at the initial stand and for the number of days to reach 50% of emergence; triadimenol reduced the number of stems/plot, subcoronal internode length and the percentage of infection by B. sorokiniana on the coleoptile length, subcoronal internode, crown, and secondary roots; higher emergence speed for the varieties BR 12 of 5.0 cm and in BR 16 of 8.0 cm was found for thiran. Barley experiment: Seed treatment was not effective at the initial stand, stems/plot, emergence index and number of days to 50% of emergence; triadimenol effect decreased the coleoptile length and subcoronal internode length and the percentage of infection by B. sorokiniana on the subcoronal internode, crown, and secondary roots.