Evapotranspiração da cultura da alface dentro e fora de ambiente protegido

• Ano de defesa: 2008
• Autor(a) principal: Montes, David Rolando Palomino
• Orientador(a): Ramos, Márcio Mota
• Banca de defesa: Mantovani, Everardo Chartuni , Sediyama, Gilberto Chohaku , Hamakawa, Paulo José
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Engenharia Agrícola
• Departamento: Construções rurais e ambiência; Energia na agricultura; Mecanização agrícola; Processamento de produ
• País: BR
• Palavras-chave em Português: Lactuca sativa; Coeficiente de cultura; Irrigação
• Palavras-chave em Inglês: Lactuca sativa; Crop coefficient; Irrigation
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA::ENGENHARIA DE AGUA E SOLO
• Link de acesso: http://locus.ufv.br/handle/123456789/3518

This work was carried out at the Irrigation and Drainage Experimental Station of the Federal University of Viçosa, in Viçosa, Minas Gerais state, Brazil, from December 2007 to January 2008, cultivating Lettuce (Lactuca sativa L.) cultivar Regina, under two experimental conditions as: inside and outside a greenhouse. We aimed to a) determine the crop evapotranspiration of lettuce (ETc), b) determine the adjustment coefficient of a modified irrigâmetro device (Ki) for the first three vegetative developmental stages of lettuce, c) evaluate the effect of four water body levels established in the minilysimeters, in evapotranspiration and on the main cropping characteristics of lettuce, d) determine the water use efficiency for lettuce. All characteristics were evaluated either inside or outside the greenhouse. For each environmental condition, 560 plants were cultivated, and 336 from among them were cultivated in three blocks. In each block four treatments were carried out (T15, T20, T25 and T30) and defined by the depth of the water body (0.15; 0.20; 0.25 e 0.30 m), established in the minilysimeters of constant water body level. Each minilysimeter was connected to a modified irrigâmetro device. Over the experimental period, the meteorological data was collected in automated meteorological stations installed under the two environmental conditions. A randomized block design with split-plots was utilized to perform the statistical analysis of the crop evapotranspiration data in each of the two environmental conditions. For the production variables we did prefer to utilize a randomized block design with four water body depths and three replicates to perform the statistical analysis in each of the two environmental conditions. We concluded from our results that: seasonal crop evapotranspiration of lettuce was lower inside greenhouse as compared to outside greenhouse; crop evapotranspiration (ETc) decreased with water body depth, in each of the two environmental conditions, excepting the T30 treatment outside greenhouse; at a 15 cm depth of water body, the crop coefficient values (Kc) inside greenhouse were 0,93; 1,27 and 1,30 for the first, second and third developmental stages of lettuce, respectively, and 0,80; 1,12 and 1,39 for the same three stages outside greenhouse. There was no significant differences among fresh mass of head, leaf area, specific leaf area and fresh matter, dry matter and stem length for inside and outside greenhouse, excepting the T15 treatment which showed higher values inside greenhouse; leaf number and leaf width were higher inside greenhouse in comparison to outside greenhouse and the water use efficiency (WUE) increased with water body depth, providing the higher WUE inside greenhouse.