Substrates and floral inductors in ornamental bromeliads / Substratos e indutores de florescimento em bromélias ornamentais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The objective of this work was to study the effects of different substrates for substitution of xaxim and evaluate the aspects of growth, quality and precocity of inflorescences submitted to different doses of floral inductors in these species Tillandsia cyanea, Guzmania dissitiflora and in t this cultivar Vriesea Charlotte. The first experiment was conducted in Unit of Research and Conservation of Bromeliaceae of Plant Biology Department of Viçosa Federal University, in the period of 30th July 2006 to 28th February 2007. The treatments were constituted of different mixtures of substrates and two commercial substrates. A randomized block design experiment with three repetitions. Concluded that Tillandsia cyanea growth the substrates that showed performance equivalent to control treatment T25 (100% fiber xaxixm), and, had not fiber xaxim in its composition, were the as the follow : T1(20% sand, 20% pinus rid, 20% coconut fiber, 20% eucalyptus rid and 20% carbonized rid of rice), T6 (50% coconut fiber and 50% carbonized rid of rice) e T12 (33% pinus rid, 33% coconut fiber and 33% eucalyptus rid). In Guzmania dissitiflora the substrates T5 (50% coconut fiber and 50% carbonized rid of rice) and T22 (100% rid eucalyptus) , showed performance equivalent to control treatment T25 (100% fiber xaxixm). In Vriesea Charlotte growth, the substrates that showed performance equivalent to control treatment T25 (100% fiber xaxixm), and, had not fiber xaxim in its composition, were the as the follow: T1(20% sand, 20% pinus rid, 20% coconut fiber, 20% eucalyptus rid and 20% carbonized rid of rice), T2 (50% coconut fiber and 50% pinus rid), T3( 50% pinus rid and 50% eucalyptus rid), T4 (50% pinus rid and 50% carbonized rid of rice), T6 (50% coconut fiber and 50% carbonized rid of rice), T7 (50% eucalyptus rid and 50% carbonized rid of rice), T11 (50% sand and 50% carbonized rid of rice), T12 (33% pinus rid, 33% coconut fiber and 33% eucalyptus rid), T13 (33% pinus rid, 33% coconut fiber and 33% carbonized rid of rice), T14 (33% pinus rid, 33% eucalyptus rid, 33% carbonized rid of rice), T15 (33% coconut fiber, 33% carbonized rid of rice, 33%). The second experiment was conducted conducted at Floriculture Section of Plant Science Department of Viçosa Federal University, in the period from December 30th 2006 to February 28th 2007, in a randomized block design. The treatments were made of five ethephon doses (0, 6, 12, 24 e 48 mg/plant), five acetylene doses (0, 665, 991, 1107 and 1456 ppm) and five calcium carbide doses (0, 0,5, 1, 2 e 4 g/plant), applied on the apical meristem of plant. Verified that Tillandsia cyanea all ethephon doses and the higher acetylene dose promoted flower induction. No difference between ethephon doses for all characteristics was observed. The plants treated with ethephon precocious showed precocious development compared with plants treated with acetylene. In Guzmania dissitiflora the plants treated with 665 ppm acetylene showed more precocious bloom and the best commercial quality of inflorescence. However in Vriesea Charlotte 991 ppm acetylene showed the best relative results to inflorescence precocity.

ASSUNTO(S)

growth floral inductors indução de florescimento bormeliáceas acetylene acetileno xaxim fibers crescimento ethephon bromeliads fibra de xaxim fitotecnia ethephon

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