Resumos
Êste estudo trata da multiplicação vegetativa do bambu imperial, por meio de estacas de ramos e toletes de côlmo. Teve, por finalidade, verificar a praticobilidade desses processos em substituição ao método ortodoxo da subdivisão de touceiros, usado pora sua propagação. Os resultados obtidos mostram que ambos os processos são bastante eficientes, desde que sejam respeitadas os seguintes regras básicas: 1) utilizar apenas 05 bases de ramos para fornecimento das estacas; 2) plantar os toletes de côlmo em posição horizontal. Foram obtidas, dessa maneira, os seguintes porcentagens de enraizamento: 70,5% para estacas de base de ramo e 99% para toletes de côlmo.
The common method of propagating Bambusa vulgaris Schrad. var. vittata A. et C. Riv., like other clump bamboos, is by division. This method, although quite effective, has the disadvantage of being economically impractical to supply commercial demands of planting material for large scale bamboo plantations. This study deals with the assexual propagation of this bamboo species by branch cuttings and culm sections as propagating material, to overcome the disadvantage of propagation by clump division. Branch cuttings and culm sections were obtained from 80 culms, 40 being about I year old and 40 about 3 years old. Two hundred branch cuttings and one hundred culm sections were taken for each culm age group and divided into five subgroups for treatment or not with the following root-promoting substances: Trilone (2,4-D), Dieradix D, Dieradix MD, and alpha-naphthylacetic acid. Two types of branch cuttings were taken from the middle and top sections of each culm age group: a) the basal enlarged portion of the branch, including 3 nodes and 2 internodes, besides a little portion of the culm wood attached to the base; b) the next portion of the same branch, including 3 nodes and 2 internodes. So, there were 10 branch cuttings in each treatment including the untreated check, for each culm age group in this investigation. Two types of culm sections were taken for each culm age group: a) culm base sections, consisting of two nodes with one "eye" or dormant bud in each node; b) culm middle sections, consisting of two nodes, each one with the enlarged basal portion and two nodes of the main branch attached to it. Culm sections were planted in two positions: a) horizontally, about four inches below soil level; b) slanting, with the top node at soil level. So, there were 5 culm sections in each treatcent, including the untreated check, for each culm age group in this trial. The experiment was performed from October 10, 1961 to March 28, 1962, and brought ou the following findings: Branch cuttings: 1. Treatment with root-promoting substances gave some response only in case of alfa-naphthylacetic ocid. Within treatments the percentage of cuttings rooted was 48.7 for both types and ages of branch cuttings; and 80.0 per cent, considering only the branch cuttings made of the basal portion of the branches. Untreated check gave 38.7 per cent ond 77.5 per cent, respectively. 2. Number of juvenile culms and "horns" (new culms beginning to grow and not yet emerged from the ground) was greater in the rooted branch cuttings that were treated with alpha-nophthylacetic acid. 3 Rooting was best for the branch cuttings made of basal portions of branches ond taken from the middle section of the culm. Culm sections: 1 . Horizontal planting gave better rooting results with 99.0 per cent against 71 .0 per cent for slanting planting. 2. Concerning rooting at both nodes, culm sections prepared from the middle culm portion had a higher rooting ability than those taken from the basal culm portion. 3. Culm age had no effect on culm section rooting as well as the treatment with root-promoting substances.
Júlio César Medina; Dirceu Ciaramello; Guilherme Augusto de Paiva Castro
Engenheiros-agrônomos, Seção de Plantas Fibrosas, Instituto Agronômico.
RESUMO
Êste estudo trata da multiplicação vegetativa do bambu imperial, por meio de estacas de ramos e toletes de côlmo. Teve, por finalidade, verificar a praticobilidade desses processos em substituição ao método ortodoxo da subdivisão de touceiros, usado pora sua propagação.
Os resultados obtidos mostram que ambos os processos são bastante eficientes, desde que sejam respeitadas os seguintes regras básicas: 1) utilizar apenas 05 bases de ramos para fornecimento das estacas; 2) plantar os toletes de côlmo em posição horizontal.
Foram obtidas, dessa maneira, os seguintes porcentagens de enraizamento: 70,5% para estacas de base de ramo e 99% para toletes de côlmo.
SUMMARY
The common method of propagating Bambusa vulgaris Schrad. var. vittata A. et C. Riv., like other clump bamboos, is by division. This method, although quite effective, has the disadvantage of being economically impractical to supply commercial demands of planting material for large scale bamboo plantations.
This study deals with the assexual propagation of this bamboo species by branch cuttings and culm sections as propagating material, to overcome the disadvantage of propagation by clump division.
Branch cuttings and culm sections were obtained from 80 culms, 40 being about I year old and 40 about 3 years old. Two hundred branch cuttings and one hundred culm sections were taken for each culm age group and divided into five subgroups for treatment or not with the following root-promoting substances: Trilone (2,4-D), Dieradix D, Dieradix MD, and alpha-naphthylacetic acid.
Two types of branch cuttings were taken from the middle and top sections of each culm age group: a) the basal enlarged portion of the branch, including 3 nodes and 2 internodes, besides a little portion of the culm wood attached to the base; b) the next portion of the same branch, including 3 nodes and 2 internodes. So, there were 10 branch cuttings in each treatment including the untreated check, for each culm age group in this investigation.
Two types of culm sections were taken for each culm age group: a) culm base sections, consisting of two nodes with one "eye" or dormant bud in each node; b) culm middle sections, consisting of two nodes, each one with the enlarged basal portion and two nodes of the main branch attached to it.
Culm sections were planted in two positions: a) horizontally, about four inches below soil level; b) slanting, with the top node at soil level. So, there were 5 culm sections in each treatcent, including the untreated check, for each culm age group in this trial.
The experiment was performed from October 10, 1961 to March 28, 1962, and brought ou the following findings:
Branch cuttings:
1. Treatment with root-promoting substances gave some response only in case of alfa-naphthylacetic ocid. Within treatments the percentage of cuttings rooted was 48.7 for both types and ages of branch cuttings; and 80.0 per cent, considering only the branch cuttings made of the basal portion of the branches. Untreated check gave 38.7 per cent ond 77.5 per cent, respectively.
2. Number of juvenile culms and "horns" (new culms beginning to grow and not yet emerged from the ground) was greater in the rooted branch cuttings that were treated with alpha-nophthylacetic acid.
3 Rooting was best for the branch cuttings made of basal portions of branches ond taken from the middle section of the culm.
Culm sections:
1 . Horizontal planting gave better rooting results with 99.0 per cent against 71 .0 per cent for slanting planting.
2. Concerning rooting at both nodes, culm sections prepared from the middle culm portion had a higher rooting ability than those taken from the basal culm portion.
3. Culm age had no effect on culm section rooting as well as the treatment with root-promoting substances.
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LITERATURA CITADA
Recebido para publicação em 13 de junho de 1962.
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1COBIN, M. La propagación del bambu usando esquejes de los ramos laterales promete. In Informe de Estación Experimental Federal en Puerto Rico 1944:36-38. 1946.
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2MEDINA, JÚLIO CÉSAR. Multiplicação do bambu. O Agronômico 13 (n.os1-2), jan.-fev. 15-17. 1961.
Propagação vegetativa do Bambu imperial (Bambusa vulgaris Schrad. var. vittata A. et C. Riv.)
Datas de Publicação
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Publicação nesta coleção
02 Mar 2010 -
Data do Fascículo
1962
Histórico
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Recebido
13 Jun 1962
