Vegetable production plays a major socio-economic role because it is labor intensive.The objective of this study was to evaluate the physiological performance of carrot seed after priming (osmotic preconditioning), fungicide treatment and polymer film coating. Carrot seeds cv. Brazlândia were provided by Hortec, Bagé / RS and submitted to priming with an aerated solution of polyethylene glycol (PEG 6000) at - 0.8 MPA for 10 hours. Seeds were then rinsed with distilled water and oven dried until moisture content was 7%. The seeds were treated with Captan 750 TS® (750g a.i.) fungicide at a dosage of 0.2% and coated with the polymer Colorseed® at a dosage of 50 ml.kg-1. Seed treatments were: no osmoconditioning (NCOND), with osmoconditioning (COND), no polymer (SP), with polymer (CP), no fungicide (SF) and with fungicide (CF), making up the following combinations: 1) NCOND SP SF, 2) NCOND CP SF, 3) NCOND SP CF, 4) NCOND CP CF, 5) COND SP SF, 6) COND CP SF, 7) COND SP CF e 8) COND SP CF. Seed quality was evaluated using the following tests: germination, cold, modified accelerated aging, greenhouse emergence, germination and emergence velocity index, seedling length, seedling dry and fresh matter weight. The statistical design was completely randomized in a 2 (primed and not-primed seeds) x 4 (treatments with fungicide and polymer) factorial, with four replications. Averages were compared by the Duncan test at the 5% significance level. Osmoconditioning increases the speed of germination and seedling emergence; the application of polymer and fungicide on osmoconditioned carrot seed did not affect seedling vigor and regardless of the coating and/or fungicide treatment, the osmoconditioned seeds performed better.
Daucus carota; priming; polymer; chemical treatment; physiological quality
