The Agronomic performance and physicochemical characteristics of onion genotypes under different spacing in the humid Amazonian tropics

The Agronomic performance and physicochemical characteristics of onion genotypes under different spacing in the humid Amazonian tropics




Allium cepa L., bulbs, climate adaptation, planting density, sensory analysis, post-harvest


The Southwest region of Pará state, Brazil, imports 100% of all onion consumed from other regions of the country, which generates market dependence and raises the product's costs. The present study investigated parameters related to germination, agronomic performance and postharvest characteristics of five onion cultivars at different planting densities. The experiment was conducted in two stages. In the first, in a greenhouse, the germination kinetics was evaluated. In the second, in the field, the seedlings were transplanted into beds. The experimental design was in complete randomized blocks in a 5 x 3 factorial scheme with three replications. The treatments consisted of the combination of five cultivars (Mata Hari, Dulciana, Cimarron, NUN 1205-F1 and Vale Ouro IPA 11) and three line spacing (20, 30 and 40 cm) 8 cm between plants. As for the germination rate (GR), the results allowed to highlight the cvs. Cimarron and Vale Ouro IPA 11 with an 80.55% and 77.77% of GR, respectively. There was a significant difference for total bulb productivity, highlighting Vale Ouro IPA 11 in the 8 x 20 cm spacing. For the bulb diameter, cv. Vale Ouro IPA 11 obtained the best results in all classes. In the average weight of the bulbs, cv. Vale Ouro IPA 11 in the 8 x 40 cm spacing was the best treatment with 60.77g. As for total soluble solids, cv. Vale Ouro IPA 11 presented °Brix higher than the others, being significant at 1%. These results demonstrate that it is possible to produce quality onions in the Southwest region of Pará, which would reduce prices, since all commercialized onions come from regions outside the state.


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Author Biographies

Luiz Carlos Piacentini, Federal University of Para

Faculty of Agronomic Engineering

Bruna Corrêa Moreira, Federal University of Para

Faculty of Agronomic Engineering

Cláudia Barbosa Cordeiro, Federal University of Para

Faculty of Agronomic Engineering

Augusto Uchoa de Andrade, Federal University of Para

Faculty of Agronomic Engineering

Marcos Ribeiro da Silva Vieira, Federal University of Para

Professor, Dept. of Agronomic Engineering

Miguel Alves Júnior, Federal University of Para

Professor, Dept. of Agronomic Engineering


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How to Cite

Piacentini, L. C., Moreira, B. C., Barbosa Cordeiro, C., Andrade, A. U. de, Vieira, M. R. da S., & Alves Júnior, M. (2021). The Agronomic performance and physicochemical characteristics of onion genotypes under different spacing in the humid Amazonian tropics. International Journal for Innovation Education and Research, 9(4), 331–349.
Received 2021-03-16
Accepted 2021-03-24
Published 2021-04-01