Produção de gérbera de corte em resposta à frequência de fertirrigação com base na irradiância solar global

• Ano de defesa: 2010
• Autor(a) principal: Muniz, Moisés Alves
• Orientador(a): Barbosa, José Geraldo
• Banca de defesa: Pinto, Cleide Maria Ferreira , Steidle Neto, Antônio José
• 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: Gérbera jamesonii; Frequência de fertirrigação; Análise de crescimento; Qualidade
• Palavras-chave em Inglês: Gérbera jamesonii; Irrigation frequency; Growth analysis; Quality
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FLORICULTURA, PARQUES E JARDINS::FLORICULTURA
• Link de acesso: http://locus.ufv.br/handle/123456789/1134

An experiment was carried out in a greenhouse, with gerbera culture, aiming at: i) comparing qualitative and productive performance of cut gerbera, in a hydroponic system, in response to irrigation frequency set on the basis of global solar irradiance accumulation with timed control system; ii) determining accumulate value of the most suitable global solar irradiance for the setting of irrigation frequency for cultivation of gerbera; iii) evaluating the effect of irrigation frequency in the physiological indexes of gerbera plants over the year. Gerbera, Dinamyte variety was planted in 6-dm3 pots filled with substrate (vegetable coal: perlite: vermiculite) at the volumetric proportion of 30:30:40%. Treatments were set in random blocks, in a splitplot scheme. The plots were the irrigation frequencies set on the basis of global solar irradiance accumulation (0.5; 1.5; 2.5 and 3.5 MJ/m2) + control (irrigation with an every-2 hour frequency, from 6:00 a.m. to 6 p.m., controlled by timer) and the splitplots were 5 evaluation seasons over the year, with three replicates. The different irrigation frequencies set on the basis of the solar irradiance accumulation did not differ from the timer control for the following characteristics: start of commercial harvest, height and diameter of the plant, dry mass of the root, rhizome dry mass, inflorescence diameter, stem length, fresh mass and floral stem dry mass and longevity of the inflorescence. For the characteristics of evapotranspiration of the plant, applied volume of water, leaf area, leaf dry mass, plant dry mass and total production of inflorescence, the frequency of irrigation established on the basis of solar irradiance accumulation of 0.5 MJ/m2 provided results higher than the ones provided by the control. For absolute and relative growth rate of the root, rhizome, leaf and plant, there were no differences among the plants grown under different irrigation frequencies set on the basis of solar irradiance accumulation and under timer control. However, for use of water efficiency, the irrigation frequency set on the basis of solar irradiance accumulation of 3.5 MJ/m2 provided values higher than the other irrigation frequencies. Based on the obtained results, it can be concluded that irrigation frequency set on the basis of irradiance accumulation replaces the timer control because it provided higher plant growth and floral stem production, as well as a higher efficiency on distribution and quantity of applied water. The events of fertigation for gerbera have to occur when the value of global solar irradiance accumulation reaches 0.5 MJ/m2; the highest variation of physiological indexes was provided by the evaluating period, showing the adaptive ability of gerbera for water regime.