Growth of Mabea fistulifera, Cedrela fissilis, and Cariniana legalis in response to potassium fertilization
DOI:
https://doi.org/10.4336/2026.pfb.46e202502368Keywords:
Potassium fertilizers, Seedling production, Quality parametersAbstract
Potassium (K) plays an essential role in plant growth; however, its influence on Brazilian native tree species remains poorly understood. This study evaluated the effects of seven K2O rates (0 to 300 mg dm-3) on the growth and seedling quality of Mabea fistulifera, Cedrela fissilis, and Cariniana legalis cultivated in a Red-Yellow Latosol for 120 days after sowing. The experiment was conducted in a randomized complete block design, and the data were subjected to regression analysis. Height, collar diameter, dry biomass, morphological ratios, and the Dickson Quality Index (DQI) were evaluated. M. fistulifera showed a significant response only for root dry mass. In C. fissilis, all variables responded to potassium supply, leading to increases in seedling growth and quality, especially in height, biomass accumulation, and DQI. For C. legalis, significant responses were observed only for collar diameter and shoot dry mass. These results demonstrate interspecific differences in response to potassium fertilization, indicating the need for species-specific fertilization recommendations to optimize the production of native forest seedlings.
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