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URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
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Resultados da Pesquisa
Item Quantitative analysis of growth in coffee plants cultivated with a water-retaining polymer in an irrigated system(Universidade Federal do Ceará, 2016-01) Souza, Antonio Jackson de Jesus; Guimarães, Rubens José; Colombo, Alberto; Sant’Ana, José Antonio do Vale; Castanheira, Dalyse ToledoThis study aimed to evaluate the use of hydro polymer retainer in the quantitative growth of coffee plants at different levels of irrigation and soil types. The experiment was conducted in pots with seedlings bag in the greenhouse of the Setor de Cafeicultura, Universidade Federal de Lavras. The experimental design was in randomized blocks in factorial (2x4x2): absence or presence of hydro polymer retainer, four levels of irrigation (25%, 50%, 75% and 100%), two soil types (sandy soil and medium texture). At 150 days evaluated the stem diameter, plant height, leaf area, number of leaves, dry weight of shoots, plant dry mass, root dry weight, root dry weight ratio of shoot, leaf area ratio, absolute growth rate, relative growth rate, net assimilation rate and leaf area index. It was concluded that the polymer hydro retainer hydrated favored the growth of coffee plants and irrigation promoted greater growth of coffee in medium textured soil compared to soils with sandy texture.Item Critical ranges for leaf nitrogen and potassium levels in coffee fertigated at the production phase(Universidade Federal do Ceará, 2015-01) Assis, Gleice Aparecida de; Guimarães, Rubens José; Colombo, Alberto; Scalco, Myriane Stella; Dominghetti, Anderson WilliamWith the aim of establishing critical ranges for the leaf nitrogen (N) and potassium (K) levels in fertigated coffee crops under production, an experiment was carried out in the experimental area of the Sector for Coffee Cultivation of the Department of Agriculture at the Federal University of Lavras, in Brazil. Treatments consisted of five levels of fertilizer applied through fertigation: 30%, 80%, 130%, 180% and 230% of the recommended amounts of N and K for rainfed coffee grown in Minas Gerais. A randomised block design with four replications was used. Critical ranges for nutrient concentrations in the leaves were established from the results of growth characteristics (plant height and stem diameter), leaf analyses and productivity. The results obtained were: a) nitrogen (g kg -1 ): 32.39 to 32.40 for January/February; 33.60 to 33.61 for March/April; 27.39 to 27.42 for May/June; 24.23 to 24.24 for July/August; 26.06 to 26.09 for September/October and 26.50 to 26.51 for November/December; b ) potassium (g kg -1 ): 20.08 to 20.14 for January/February; 17.89 to 17.91 for March/April; 15.93 to 15.96 for May/June; 15.29 to 15.35 for July/August; 16.61 to 16.64 for September/October and 20.58 to 20.64 for November/December.Item Drip irrigation in coffee crop under different planting densities: growth and yield in southeastern Brazil(Departamento de Engenharia Agrícola - UFCG, 2014-11) Assis, Gleice A. de; Scalco, Myriane S.; Guimarães, Rubens J.; Colombo, Alberto; Dominghetti, Anderson W.; Matos, Nagla M. S. deIrrigation associated to reduction on planting spaces between rows and between coffee plants has been a featured practice in coffee cultivation. The objective of the present study was to assess, over a period of five consecutive years, influence of different irrigation management regimes and planting densities on growth and bean yield of Coffea arabica L.. The treatments consisted of four irrigation regimes: climatologic water balance, irrigation when the soil water tension reached values close to 20 and 60 kPa; and a control that was not irrigated. The treatments were distributed randomly in five planting densities: 2,500, 3,333, 5,000, 10,000 and 20,000 plants ha -1 . A split-plot in randomized block design was used with four replications. Irrigation promoted better growth of coffee plants and increased yield that varied in function of the plant density per area. For densities from 10,000 to 20,000 plants ha -1 , regardless of the used irrigation management, mean yield increases were over 49.6% compared to the non-irrigated crop.Item Funções de produção do cafeeiro irrigado em diferentes densidades de plantio(Editora UFLA, 2013-04) Serra, Edilson Lopes; Scalco, Myriane Stella; Guimarães, Rubens José; Colombo, Alberto; Morais, Augusto Ramalho de; Carvalho, Carlos Henrique Mesquita deObjetivou-se, neste trabalho, avaliar critérios de irrigação e densidades de plantio mais adequados ao cultivo do cafeeiro que maximizem a produtividade das lavouras. O experimento foi conduzido em área do Departamento de Agricultura da Universidade Federal de Lavras/MG, em delineamento de blocos casualizados com esquema de parcelas subdivididas (densidades de plantio nas parcelas e irrigações nas subparcelas), com quatro repetições. O plantio foi realizado utilizando-se mudas sadias de cafeeiro, cultivar Rubi MG-1192. Observou-se que o uso da irrigação proporcionou aumentos expressivos de produtividade de café beneficiado em cultivos adensados de 10.000 a 20.000 plantas ha -1 . Irrigações baseadas entre tensões de 60 kPa a 100 kPa são suficientes para atender a demanda hídrica do cafeeiro em plantios adensados, porém o aumento no número de plantas de 10.000 para 20.000 compromete a sustentabilidade do cultivo pelo aumento desproporcional do consumo de água para irrigação com pequenos incrementos de produtividade. Para a tensão de irrigação de 60 kPa o aumento relativo de produtividade supera os dos demais critérios de irrigação, sendo o número de plantas indicado de 13750 plantas ha -1 .Item Production functions of irrigated coffee under different planting densities(Editora UFLA, 2013-04) Serra, Edilson Lopes; Scalco, Myriane Stella; Guimarães, Rubens José; Colombo, Alberto; Morais, Augusto Ramalho de; Carvalho, Carlos Henrique Mesquita deThe aim of this study was to evaluate criteria for irrigation and planting densities best suited to coffee growing to maximize yield. The experiment was conducted in an area of the Department of Agriculture, Federal University of Lavras, Minas Gerais, Brazil, in a randomized complete block design with split-plots and four replications. Planting was carried out using healthy coffee seedlings of the Ruby MG-1192 cultivar. It was observed that the use of irrigation provided for significant increases in processed coffee yield in high density planting from 10,000 to 20,000 plants ha -1 . Irrigations based on tensions from 60 kPa to 100 kPa are sufficient to meet the water requirements of coffee in dense plantings, but the increase in the number of plants from 10,000 to 20,000 compromises the sustainability of the crop through the disproportionate increase in water consumption for irrigation, with small increases in yield. For the irrigation tension of 60 kPa, the relative increase in yield outweighs the other criteria for irrigation, with 13,750 plants ha -1 being the number of plants indicated.