Agronomia

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http://repositorio.ufes.br/handle/10/17348
Programa de Pós-Graduação em Agronomia

Centro: CCAE
Telefone: (28) 3552 8983
URL do programa: https://producaovegetal.ufes.br/pt-br/pos-graduacao/PPGA/

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Navegando Agronomia por Assunto ".Sistema radicular"

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    Remoção de ramos ortotrópicos na poda do cafeeiro conilon e sua influência na renovação da copa, na produção e na arquitetura do sistema radicular
    (Universidade Federal do Espírito Santo, 2020-06-25) Andrade Junior, Saul de ; Amaral, Jose Francisco Teixeira Do; https://orcid.org/0000000330274830; http://lattes.cnpq.br/1032225749434466; https://orcid.org/0000000268770816; http://lattes.cnpq.br/4632534431838808; Dalvi, Leandro Pin; https://orcid.org/0000-0002-2995-8007; http://lattes.cnpq.br/7662111330884819; Fialho, Gustavo Sessa; https://orcid.org/0000-0003-4103-2976; http://lattes.cnpq.br/1104876045110330; Rodrigues, Wagner Nunes; https://orcid.org/0000-0002-4830-0040; http://lattes.cnpq.br/0154094974905867
    The aging of coffee branches leads to a fall in the productive potential of the crop, making it necessary to replace the branches with new and vigorous other ones. Thus, pruning was one of the essential practices to invigorate coffee plants. As pruning intervention is directly performed on the aerial part of the plant, the effects on the size and architecture of the canopy are evident, however, this intervention may cause a proportional effect on the root system. In this context, it is of fundamental importance to expand knowledge throughout further studies of the effects of pruning on the aspects of the Conilon coffee tree root system. Therefore, this study aimed to evaluate the influence of pruning with different removal of orthotropic branches and its implications for renewal of Conilon coffee trees on the canopy characteristics and productivity, as well as on the characteristics and special distribution of the root system. The experiment was carried out on Marilândia’s Experimental Farm (FEM) of the Capixaba Institute of Research, Technical Assistance and Rural Extension (Incaper), at an altitude of 110 meters, with rugged hilled topography. The planting was performed in September, 2010, and the plants were kept with four orthotropic branches up to 2016 (the 5th harvest), in a 3x1 meter spacing, the same specimens were used in two other distinct studies which are part of this theses. At first, to evaluate the influence of pruning on the canopy characteristics and productivity, the experiment was arranged in a randomized block design, with three treatments and eight repetitions. The plants were submitted to renewal pruning after the 5th harvest, the treatments were composed of different intensities of renewal pruning, with the removal of one, two or three orthotropic branches from each plant, however, the remaining depleted productive branches were eliminated after the 7th harvest, ending the pruning cycle. Twenty six months after the implementing of the treatments, during the phenological phase of new orthotropic branch flowering coming from shoots, the productivity of the renewal aerial part was characterized by using the average of the productivity obtained in the 2016-2017, 2017-2018 and 2018-2019 crops. In a second step, in order to evaluate the influence of pruning on the characteristics and special distribution of the root system, the experimental design was organized in a subdivided plot, considering three levels of orthotropic branch removal (25%, 50% and 75%) each plot, three levels of distance for collecting (15 cm, 30 cm and 45 cm) each subplot, and four levels of sample depth (0-10 cm, 10-20 cm, 20-30 cm and 30-40 cm) characterizing the effect of the subsubplot, following the randomized block design, with four repetitions. The plants were submitted to renewal pruning after the 5th harvest by removing one, two or three orthotropic branches each plant, and the different renewal pruning intensity compose the factors studied in the plot. In November, 2016, 130 days after the pruning, it was performed a root sample, by collecting them at a 15, 30 and 45 cm from the plant center, in layers of 0-10, 10-20, 20-30 and 30-40 cm in depth. The root samples were digitalized and processed for quantifying the root characteristics. After the analyzes, the roots were dried up to obtain the dry matter of each sample. We concluded it is possible to adopt 25, 50 and 75% of removal of orthotropic branches as a renewal pruning strategy without compromising development and productivity. Nevertheless, the intensity of the removal of orthotropic branches influences the characteristics of the root system, causing changes in the biomass spatial distribution, so that the use of lower intensity pruning leads to a more concentrated and heterogeneous location whereas the increase in intensity promotes the uniformity of the root biomass distribution