Comparação dos métodos de manejo da irrigação do meloeiro (Cucumis melo L.) cultivado na região central do estado do Tocantins

• Ano de defesa: 2010
• Autor(a) principal: Freitas Júnior, Raul Rodrigues de
• Orientador(a): Oliveira, Rubens Alves de
• Banca de defesa: Alencar, Carlos Augusto Brasileiro de , Hamakawa, Paulo José , Silva, Demetrius David da
• 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: Irrigâmetro; Tanque classe A; Balanço hídrico; Evapotranspiração
• Palavras-chave em Inglês: Irrigameter; Class A tank; Water balance; Evapotranspiration
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA::ENGENHARIA DE AGUA E SOLO
• Link de acesso: http://locus.ufv.br/handle/123456789/3579

This work was carried out at the experimental area of São João Fruitculture Center in Porto Nacional, TO, from August to October 2008, to evaluate the irrigameter technology, applied for the irrigation management of the melon plant (Cucumis melo L.) cultivated in the state of Tocantins, compared to the methods Class Atank and hydric balance, using the computational program REF-ET. The melon culture was sown in an area of 0.5 ha, whose soil is classified as Red-Yellow Latosol .Soil samples were taken from the 0-20 cm depth layer to determine their physical-hydric characteristics, aiming at irrigameter adjustment. The culture was irrigated by a drip irrigation system with 0.30 m spaced emmitters along the lateral line. The irrigation system was previously evaluated to obtain water distribution uniformity and application intensity. This evaluation was used to adjust the temporal rule of the irrigameter and the calculus of total amount of irrigation to be applied based on the other management methods used in this research. The melon culture was sown in 0.30 m spaced holes, with thinning being conducted 13 days after emergence, leaving one seedling per hole, to obtain a population of around 8.760 plants per hectare. The results obtained allowed concluding that: a) the irrigameter and Class A tank overestimated the evapotranspiration of the melon plant culture compared to the hydric balance method, using the computer program REF-ET; and b) in the irrigameter, the evaporatory water level must be established at the value corresponding to the inferior half of the recommended rate, for the several developmental phases of the melon plant culture, in order to offset the culture’s evapotranspiration reduction by decreasing the wet or shaded area.