Progresso da ferrugem do cafeeiro irrigado em diferentes densidades de plantio pós-poda
Data
2011-01
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Editor
Editora UFLA
Resumo
Objetivou-se, no presente trabalho, avaliar o efeito de diferentes critérios para manejo da irrigação em quatro densidades de plantio, sob sistema de gotejamento na incidência e severidade da ferrugem do cafeeiro e avaliar a influência do enfolhamento na curva de progresso dessa doença. Conduziu-se, o experimento, em área experimental da Universidade Federal de Lavras – MG, utilizando a cultivar Rubi MG-1192 com seis anos. O delineamento experimental foi em blocos ao acaso com quatro repetições. Os tratamentos foram constituídos por quatro parcelas representadas pelas densidades de plantio (convencionais e adensados): 2500 (4,0x1,0 m), 3333 (3,0x1,0 m), 5000 (2,0x1,0 m), 10000 (2,0x0,5 m) plantas ha -1 , quatro subparcelas sendo: irrigações quando a tensão da água no solo atingiu valores de 20 e 60kPa; irrigações utilizando o manejo do balanço hídrico (calculado através do software IRRIPLUS), com turnos de irrigação fixos de três dias por semana e uma testemunha sem irrigação, perfazendo um total de 16 tratamentos. Cada subparcela foi constituída por 10 plantas, sendo consideradas como plantas úteis as seis centrais. Foram avaliadas a incidência e severidade da ferrugem e a porcentagem de enfolhamento das plantas de cafeeiros. Após análise estatística, os dados foram convertidos em área abaixo da curva de progresso da doença e do crescimento. Verificou-se que os critérios para manejo da irrigação influenciaram a curva de progresso do crescimento, porém, não interferiu na curva de progresso da incidência e da severidade da ferrugem. Os sistemas de plantios adensados favoreceram a incidência da ferrugem. Mas as densidades de plantio não interferiram no enfolhamento.
The objective of this study was to evaluate the effect of different irrigation controls implemented in four planting densities on a system of drip on the incidence and severity of rust and to assess the influence of leaf growth on the progress curve of this disease. The experiment was conducted in the experimental area of the Federal University of Lavras - MG, using the cultivar Rubi MG-1192 with 6 years. The experimental design was randomized blocks with four replicates. The treatments consisted of four tranches represented by planting densities (conventional and non-conventional): 2500 (4.0 x1.0 m), 3333 (3.0 x 1.0 m), 5000 (2.0 x 1.0 m), 10,000 (2.0 x 0.5 m) plants / ha, with four subplots: the tension when irrigation water in the soil reaches values of 20 and 60kPa; using water balance management of irrigation (calculated by the software IRRIPLUS) with rounds of irrigation fixed three days per week and a control without irrigation, making a total of 16 treatments. Each subplot line consisted of 10 plants with the six central plants considered as useful. The incidence and severity of rust and the percentage of grown of coffee plants were evaluated. After statistical analyses the data were converted to area under the curve of disease and growth progress. It was verified that the management of irrigation influenced the progress curve of growth, but it did not interfere in the progress curve of the incidence and severity of coffee rust. The dense system of plantation favored the incidence of rust. However, the planting densities did not affect growth.
The objective of this study was to evaluate the effect of different irrigation controls implemented in four planting densities on a system of drip on the incidence and severity of rust and to assess the influence of leaf growth on the progress curve of this disease. The experiment was conducted in the experimental area of the Federal University of Lavras - MG, using the cultivar Rubi MG-1192 with 6 years. The experimental design was randomized blocks with four replicates. The treatments consisted of four tranches represented by planting densities (conventional and non-conventional): 2500 (4.0 x1.0 m), 3333 (3.0 x 1.0 m), 5000 (2.0 x 1.0 m), 10,000 (2.0 x 0.5 m) plants / ha, with four subplots: the tension when irrigation water in the soil reaches values of 20 and 60kPa; using water balance management of irrigation (calculated by the software IRRIPLUS) with rounds of irrigation fixed three days per week and a control without irrigation, making a total of 16 treatments. Each subplot line consisted of 10 plants with the six central plants considered as useful. The incidence and severity of rust and the percentage of grown of coffee plants were evaluated. After statistical analyses the data were converted to area under the curve of disease and growth progress. It was verified that the management of irrigation influenced the progress curve of growth, but it did not interfere in the progress curve of the incidence and severity of coffee rust. The dense system of plantation favored the incidence of rust. However, the planting densities did not affect growth.
Descrição
Palavras-chave
Hemileia vastatrix, Coffea arabica, Sistema de plantio, Irrigação
Citação
PAIVA, B. R. T. L. et al. Progresso da ferrugem do cafeeiro irrigado em diferentes densidades de plantio pós-poda. Ciência e Agrotecnologia, Lavras,v. 35, n. 1, p. 137-143, jan./fev., 2011.