Acta Scientiarum Agronomy
URI permanente para esta coleçãohttps://thoth.dti.ufv.br/handle/123456789/11111
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Item Comparison between grafting and cutting as vegetative propagation methods for conilon coffee plants(Editora da Universidade Estadual de Maringá - EDUEM, 2013-10) Andrade Júnior, Saul de; Alexandre, Rodrigo Sobreira; Schmildt, Edilson Romais; Partelli, Fábio Luiz; Ferrão, Maria Amélia Gava; Mauri, Aldo LuizThe purpose of this study was to assess the growth of conilon coffee tree plantlets that were propagated by grafting and cutting. The experiment was conducted at the plantlet production site of Incaper’s Experimental Farm in the city of Marilândia, Espírito Santo State. For grafting, plantlets derived from the seed propagation of Coffea canephora cv. Robusta Tropical (ENCAPER 8151) were used as rootstocks, and six clones of cv. Conilon Vitória (INCAPER 8142) were used as the grafts. The cutting was performed with six clones that were used for grafting. The experimental design consisted of randomized blocks of twelve treatments with five repetitions composed of twelve plantlets. On the hundred and fifth day, the averages of the variables were assessed and compared by the Scheffé test at a probability of 5%. The grafted plantlets were superior for almost all of the characteristics assessed, which suggests that it is possible to propagate conilon coffee trees.Item Growth effects of water excess on coffee seedlings (Coffea arabica L.)(Editora da Universidade Estadual de Maringá - EDUEM, 2014-04) Silveira, Helbert Rezende de Oliveira; Santos, Meline de Oliveira; Alves, Jose Donizeti; Souza, Kamila Rezende Dázio de; Andrade, Cinthia Aparecida; Alves, Raphaella Gomes MartinsThe objective of the present study was to evaluate the interference of water excess in soil on the growth of young coffee plants of the Mundo Novo and Catuaí cultivars.Plants were subjected to the following three different substrate water availability conditions: control (well- watered), continuous substrate waterlogged, and intermittent substrate waterlogged. Several growth- related traits were evaluated over the course of 19 weeks. Based on the number and quality of the affected variables from all forms of analyses, the Catuaí cultivar showed greater sensitivity to waterlogging. Both cultivars exhibited growth inhibition in response to substrate waterlogging stress, which was exacerbated by premature leaf dropping.Item Image analysis of coffee seeds submitted to the LERCAFE test(Editora da Universidade Estadual de Maringá - EDUEM, 2016-07) Ribeiro, Bárbara Gomes; Abraão, Christovão Pereira; Nery, Marcela Carlota; Nacimento, Rodrigo Marques; Rezende, Juliana Costa; Fialho, Cíntia Maria TeixeiraThe aim of this experiment was to quantify the stained areas of coffee seeds submitted to the LERCAFE test using image analysis. The seeds used were of the Catuaí Vermelho IAC 99 and Paradise cultivars. The physiological quality of the lots was assessed using germination tests, moisture content and a germination speed index. The LERCAFE test was conducted using seeds without parchment immersed in a solution of 3% sodium hypochlorite for 3 hours. Color photographs (RGB) with a resolution of 5 MPx were taken of each seed. The seeds were visually evaluated, and the functions generated from the analyses of the stained and non-stained regions were quantified by the Matlab R2009b program. Classification models were developed based on the Fisher Linear Discriminant Function and the evaluation of the adequacy of the models confusion matrix between the visual references and the classification generated by the linear functions. The image analysis for the creation of Fisher’s linear discriminant function in the development of classifiers for the coffee seeds submitted to the LERCAFE test is potentially efficient; however, it remains necessary to test other discriminant functions and quantification methodologies.