Coeficiente de cultura para a mamoneira em plantio adensado

• Ano de defesa: 2011
• Autor(a) principal: Miranda, Wezer Lismar
• Orientador(a): Carvalho, Luiz Gonsaga de
• Banca de defesa: Carvalho, Maria Laene Moreira de, Castro Neto, Pedro, Vilas Boas, Renato Carvalho
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: UNIVERSIDADE FEDERAL DE LAVRAS
• Programa de Pós-Graduação: DEG - Programa de Pós-graduação
• País: BRASIL
• Palavras-chave em Português: Ricinus communis L.; Safrinha; Evapotranspiração; Lisímetro de drenagem; Evapotranspiration; Drainage lysimeter
• Área do conhecimento CNPq: CNPQ_NÃO_INFORMADO
• Link de acesso: https://repositorio.ufla.br/handle/1/3618

The demand for castor seed oil increases every year due to its many industrial uses and its use as biofuel. In order to meet that demand different castor bean handling techniques have been implemented, with emphasis on the cultivation during the off-season in rotation with other crops, high density planting and irrigation. This research was conducted to determine the crop coefficient (Kc) of castor bean with high density planting under the weather conditions in Lavras, Minas Gerais, Brazil, using a drainage lysimeter. The determination of Kc depends on an adequate estimation of reference evapotranspiration (ETo) and the measurement of crop evapotranspiration (ETc) of interest. Three drainage lysimeters were used to measure crop water use. Each lysimeter is 1.2 m x 1.4 m in surface area and 1.2 m deep. Eight seedlings of castor bean cultivar Al Guarany 2002 were planted in the lysimeters with 0.3 m spacing between plants and 0.7 m between rows. In one lysimeter a battery of tensiometers was installed at depths of 0.1; 0.2; 0.4; 0.6; 0.8 and 1.0 m for soil moisture monitoring and control of replacement of drained water. The ETc was recorded in the range of 5 to 12 days, as indicated by the end of the drainage. ETo was estimated by the Penman-Monteith-FAO. From the ETc/ETo the Kc was obtained for various periods during the crop cycle. The ETc and Kc were considered by the average values observed in the three drainage lysimeters used. ETc values found in the initial growth, intermediate and final stages were 1.65; 3.07; 9.14 and 5.85 mm d-1 respectively. Kc values for the corresponding phases were 0.98; 1.41; 2.11 and 1.65 respectively.