Coffee Science_v.17, 2022
URI permanente para esta coleçãohttps://thoth.dti.ufv.br/handle/123456789/13712
Navegar
3 resultados
Resultados da Pesquisa
Item Effect of indole-3-acetic acid on growth, physiology and nutritional status of young arabica coffee plants(Universidade Federal de Lavras, 2023-01-20) Erlacher, Wellington Abeldt; Amaral, José Francisco Teixeira do; Amaral, José Augusto Teixeira do; Christo, Bruno Fardim; Ferreira, Daniel Soares; Tatagiba, Sandro Dan; Rocha, Brunno Cesar Pereira; Tomaz, Marcelo Antonio; Rodrigues, Wagner Nunes; Partelli, Fábio LuizCoffee is one of the main agricultural commodities in the world. Thus, research aimed at reducing the productive risks of the crop has been increasingly encouraged, among which the use of plant hormones stands out. In addition, the objective of this work was to analyze the effect of the application of indole-3-acetic acid on the growth, nutrition and gas exchange of young Coffea arabica L plants. The experiment was carried out in the field in the city of Alegre, Espírito Santo, Brazil. The experimental design used was randomized blocks, testing the effect of the application of five doses of indole-3-acetic acid in young Arabica coffee plants, in four replications. The application of indole-3-acetic acid stimulates the growth rate of the stem diameter at a concentration of 60 mg L-1, as well as gas exchange in coffee plants, however it did not favor the increase in the substomatic concentration of CO2 instantaneous and intrinsic efficiency in water use and instantaneous carboxylation efficiency. Although the application of EIA was not able to provide direct gains in coffee growth during the experimental period, a longer evaluation of the treatments would possibly provide promising results for the coffee crop. The multivariate analysis showed that higher doses of auxin have a high relationship with the macronutrients studied.Item Looking for adjustments to severe drought in coffee: lessons of a rainfall exclusion plot in the Southern Brazil(Universidade Federal de Lavras, 2022-12-29) Silva, Debora Valim da; Naves, Vicente Luiz; Toro-Herrera, Mayra Alejandra; Vieira, Daniel Amorim; Mendonça, Ane Marcela das Chagas; Rambal, Serge; Barbosa, João Paulo Rodrigues Alves DelfinoRainfall exclusion experiments allow us assessing the effects of environmental stresses such as long-term water limitations on both leaf and canopy structural traits. This work aimed to evaluate how leaf anatomical traits and canopy development of productive coffee trees change when submitted to more dry conditions in the southern region of Minas Gerais - Brazil. The experimental plots have been set up in a plantation area in which is growing Coffea arabica L. cv. Mundo Novo- IAC 379-19, in a completely randomized arrangement, composed by three treatments: Control (C) - no gutter system; Control plus roof (Ĉ) and Exclusion system (E). Leaf anatomical and canopy traits were determined within a year at the end of each season: late Spring- 2015 (Sp), and late Summer (Su), late Autumn (Au) and late Winter (Wi) - 2016. During the studied period the rainfall exclusion condition led to a reduction in the relative water content (RWC) of leaves. In the leaf-level, as the dry condition increase, the leaves invested in thicker cuticles, reduced xylem and phloem areas and smaller stomata, especially with the rainfall exclusion. In the canopy-level, there was a remarkable reduction in leaf area index (LAI) especially in the winter as a strategy of reduction of transpiratory area, when the availability of water decreased around 25%. In a context of reduced water availability due to effects of climate change, coffee trees may be able to present modifications at both levels, to cope with the effects of this abiotic stress.Item Initial performance of coffee trees with different fertilizationand irrigation management(Universidade Federal de Lavras, 2022-06-09) Silva Júnior, José Geraldo da; Pin, Iago Parmanhani; Ferreira, Daniel Soares; Castanheira, Dalyse ToledoCoffee is one of the main agricultural commodities in the world. However, due to its sensitivity to water stress and changes in the availability of finite sources of nutrients and the constant search for a more sustainable agriculture, it is necessary to modulate the responses of plants to soil water and the real nutritional demand of the coffee tree. Thus, the objective of this work was to analyze the initial performance of arabica coffee grown with or without water restriction and with five different soil fertilization managements, in order to propose more techniques to optimize coffee production. The exper-iment was carried out in a greenhouse, in the experimental area of the Federal University of Viçosa, in the city of Viçosa-MG. The experimental design was completely randomized in a 2x5 factorial scheme, with two irrigation depths (40% and 80% of the available water in the soil) and five fertilization managements (conventional 100% of the recommended dose, controlled release of 80 and 100% of N and recommended K and organomineral 80 and 100% N and K of the recommended dose). In view of the observed results, it can be observed that water restriction in the initial period of coffee develop-ment provided a reduction in the variables of root and shoot growth of the plants, regardless of the soil fertilization management used. In environments with greater water restriction, no significant difference was observed between the studied fertilizers and in an environment without water restriction, the controlled release fertilizer 80% presented the highest global growth averages. Water management provided a greater effect on coffee nutrient dynamics than duly studied fertilization management.