Efeitos da irrigação e fertirrigação na produção e no desenvolvimento do cafeeiro na região oeste da Bahia

• Ano de defesa: 2010
• Autor(a) principal: Vicente, Marcelo Rossi
• Orientador(a): Mantovani, Everardo Chartuni
• Banca de defesa: Alvarenga, Antônio de Pádua , Oliveira, Rubens Alves de , Drumond, Luis César Dias
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Engenharia Agrícola
• Departamento: Construções rurais e ambiência; Energia na agricultura; Mecanização agrícola; Processamento de produ
• País: BR
• Palavras-chave em Português: Manejo de irrigação; Irrigação localizada; Evapotranspiração
• Palavras-chave em Inglês: Irrigation management; Irrigation; Evapotranspiration
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA::ENGENHARIA DE AGUA E SOLO
• Link de acesso: http://locus.ufv.br/handle/123456789/680

This study aimed to evaluate the effects of irrigation and fertigation on coffee plants development and production and on root system development under drip irrigation in the west of Bahia state. For this, two experiments were assembled at Café do Rio Branco Farm, in Barreiras, Bahia state, in 3.5-yearsold coffee plants, Catuaí Vermelho IAC 144. The first experiment was performed in a randomized complete block design consisting of five treatments, 75, 85, 100, 125 and 150% of water depth calculated by the Irriplus software. The second experiment was performed in a 3 x 3 factorial design with three nitrogen and potassium levels (900/800, 600/500 and 300/250 kg ha-1 yr-1 of N and K2O) in three frequencies of fertigation (2, 4 and 8 times per month). By the end of the fourth harvest, it was noted significant effect of irrigation on coffee yield. The maximum yield estimated (3600 kg ha-1) was obtained by 122% of water depth. There was no significant effect of irrigation on vegetative growth, on sieve classification and on coffee fruit ripening. In relation to fertigation, the dosis of 600/500 and 900/800 kg ha-1 yr-1 N/K2O showed the highest coffee yield and the frequency of two and eight times per month had higher yield. There was no effect of the dosis and the fertigation frequency on coffee fruitripening and on sieve classification. There was no significant effect of the treatments (irrigation and fertigation) on specific leaf area - SLA, but leaves with greater exposure to afternoon sun (North) showed lower SLA than leaves present on the South. In both experiments there was a greater concentration of roots, root length density, RLD, and root density,RD, on the topsoil (0-20 cm) and under the lateral line (30 and 70 cm from the orthotropic branch). The 75% irrigation water depth provided the highest roots concentration (RLD and RD) on the 10-cm soil layer. The lowest rates of N and K2O provided a further development of the coffee root system.