Produção de crisântemos de corte sob diferentes relações N:K e aplicação de fungicida via solução nutritiva

• Ano de defesa: 2009
• Autor(a) principal: Barbosa, Maurício Soares
• Orientador(a): Barbosa, José Geraldo
• Banca de defesa: Grossi, José Antônio Saraiva , Pedrosa, Marinalva Woods
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Fitotecnia
• Departamento: Plantas daninhas, Alelopatia, Herbicidas e Resíduos; Fisiologia de culturas; Manejo pós-colheita de
• País: BR
• Palavras-chave em Português: Crisântemo; Relação N:K; Puccinia horiana; Ciproconazol; Hidroponia
• Palavras-chave em Inglês: Chrysanthemum; System under N:K; Puccinia horiana; Ciproconazol; Hydroponics
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS
• Link de acesso: http://locus.ufv.br/handle/123456789/1121

This study aimed to evaluate the yield, the intensity of white rust (Puccinia horiana) and post-harvest longevity of chrysanthemums inflorescences for cut flowers, grown in hydroponic system under different N:K ratio and fungicide through nutritive solution. The experiments were conducted in a green house during the periods 08/16 to 11/22/207, 03/31 to 07/03/2008, and 08/22 to 11/27/2007 using a three-phase hydroponic system on a gravel substrate. The first trial was set up using a randomized block design in a factorial scheme with four N:K ratios (1.0:2.5; 1.0:3.0; 1.0:3.5; 1.0:4.0) and six cut chrysanthemums varieties (Calabria, Dark Flamengo, White Reagan, Dark Orange Reagan, Dragon e Shena Amarela) with three repetitions. The following factors were evaluated: leaf‟s dry and fresh matter weight, stem, inflorescence and the plants‟ aerial part (grams); cycle (from planting until 2/3 of open inflorescences); number of inflorescences over 3 cm; between 1 and 3 cm; and the total; number of leaves; diameter of the widest open inflorescence and stem‟s diameter and length. Besides, the longevity was evaluated, expressed as the number of days from harvest to dispose of the inflorescences and the intensity of white rust, quantified by the incidence over time of cultivation and severity at the end of the cycle. Macro and micronutrients in the 5th, 6th and 7th leaves were evaluated. Under the conditions of this work, the variety Calabria was resistant to rust with greater post-harvest life. Higher yield, longevity and quality of varieties of chrysanthemums were obtained when using the nutrient solution with the ratio N:K 1:4.0, occurring also adequate concentration of nutrients in the leaves. The second trial was set up using a randomized block design in a factorial scheme 4x2 (four ciproconazol fungicides doses - 100 g a.i. L-1 and two cut chrysanthemums varieties, White Reagan and Dark Orange Reagan) with three repetitions. The fungicide doses were 0.1; 1.0; 10.0; 15.0 g a.i. L-1. The increase of ciproconazol reduced the varieties‟ yield, quality, post-harvest life and concentration of nutrients. The third trial was set up using a randomized block design in a factorial scheme 4x5 (four ciproconazol fungicides doses - 0; 3; 6; 9 g a.i. L-1 and five cut chrysanthemums varieties: Calabria, Dark Flamengo, White Reagan, Dark Orange Reagan e Dragon) with three repetitions. The analyses were similar to the first trial. The variety Calabria was more productive, with greater post-harvest life and lower intensity of rust. It was observed a linear decrease in the area under the curve of progress of disease and the white rust severity at the end of the cycle with ciproconazol increase for the five varieties. The best yield and quality were obtained using the nutrient solution with 6 g of ciproconazol, with the leaves also exhibiting appropriate concentration of nutrients.