Given the lack of information on the use of controlled-release fertilizers in yerba mate seedlings production, this study aimed to evaluate growth and morphological characteristics of seedlings produced with two controlled-release fertilizers applied at different doses. We used seeds from a clonal seed orchard, which were sown in a commercial substrate based on peat and vermiculite, with Osmocote ® MiniPrill 3M (CRF 3M) and Basacote ® Plus 9M (CRF 9M) fertilizers, both in doses of 0, 2, 4, 6, 8, 10, and 12 kg m -3 . Seedling height and stem diameter were measured at 60, 90, 120, and 180 days after sowing and, at 180 days, shoot, root, and total biomass, tube withdrawal ease, and root aggregation. From these data, we calculated Dickson's quality index, technical efficiency, Height/Stem diameter ratio, and maximum technical efficiency dose. We verified values statistically superior to control treatment (0 kg m -3 ) in all variables in response to controlledrelease fertilizer 3M and 9M, demonstrating the viability of yerba mate seedling production using controlledrelease fertilizers. This is also evidenced through results obtained for growth in height and stem diameter. Although CRF 3M favored seedling growth, CRF 9M showed similar efficiency. The Osmocote ® MiniPrill 3M is more efficient than Basacote ® Plus 9M in most of the variables analyzed and has a lower input required to HIGHLIGHTS• Yerba mate seedlings are growth with controlled-release fertilizer.• Use of controlled-release fertilizer reduces the production costs.• The fertilizer 3M has a lower input required than fertilizer 9M.
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