Propagation of Brazil nut (Humb. y Bonpl) seedlings using seeds in mini-greenhouses

Edgar Cusi Auca, Luiz Fernandes Silva Dionisio, Ricardo Manuel Bardales-Lozano, Gustavo Schwartz

Resumo


The species Bertholletia excelsa H.B.K., the Brazil nut, is an Amazonian species belonging to the
family Lecythidaceae. It has great economic value. One of the principle means of B. excelsa propagation is
via sexual reproduction (seeds), but the presence of dormancy makes it difficult to produce seedlings, mainly
due to the long germination period, and uncertainties regarding timing. The purpose of the current study
was to describe a technology that allows the development, in mini-greenhouses, of all processes involved in
Brazil nut seedling propagation. The study evaluated response of B. excelsa seedlings to different substrates
in mini- greenhouses at the scarification, germination and growth stages. Germination counts were first
was performed five days after sowing, and ended at 40 days, when no further germination was observed.
Subsequently, germination percentages of normal and abnormal seedlings, dormant and dead seeds were
calculated. Sawdust and forest soil substrates provided a shorter husk removal time, while forest soil substrate
had the highest percentage of healthy seeds. Germination rates for B. excelsa seed in mini-greenhouses were
not affected by substrate type. The substrates sand and sand+sawdust showed highest B. excelsa seedling
development.

Palavras-chave


Germinação de sementes de Bertholletia excelsa. Escarificação de sementes. Produção de mudas de Bertholletia excelsa

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DOI: http://dx.doi.org/10.18227/1982-8470ragro.v12i4.5222

Direitos autorais 2018 REVISTA AGRO@MBIENTE ON-LINE

Revista Agroambiente On-line ISSN 1982-8470 (online), www.agroambiente.ufrr.br. E-mail: agroambiente@ufrr.br. Licença Creative Commons
Este obra está licenciado com uma Licença Creative Commons Atribuição-SemDerivações-SemDerivados 3.0 Brasil.