Publicações Científicas
URI permanente desta seçãohttps://sbicafe.ufv.br/handle/123456789/3352
Navegar
1978 resultados
Resultados da Pesquisa
Item Bayesian approach for evaluating ammonia volatilization nitrogen losses in fertilizers applied to coffee plants(Universidade Federal de Lavras, 2025) Rosa, M.; Fernandes, T. J.; Pereira, A. A.Ammonia loss through volatilization is an important reason for the lower effectiveness of nitrogen fertilizers in coffee plants. The Bayesian approach uses informative prior distributions, which help improve the precision and accuracy of inferences, leading to more robust parameter estimates. In this study, we compared the performance of different nitrogen sources applied to coffee plants in terms of nitrogen loss due to ammonia volatilization, using the nonlinear von Bertalanffy model with Bayesian inference. The stabilized fertilizers used were prilled urea (45% N), urea treated with copper and boron (44% N, 0.4% B, and 0.15% Cu), and urea treated with NBPT (45% N). The controlled-release fertilizer used was urea combined with anionic polymer (41% N). The controlled-release fertilizer used was urea combined with anionic polymer. Among the sources of nitrogen, urea coated with polymer resulted in the most significant nitrogen loss, whereas urea treated with NBPT resulted in the lowest loss of nitrogen. Compared to the other fertilizers used, urea treated with NBPT resulted in the lowest nitrogen loss through volatilization, with less than 50% of the nitrogen lost relative to urea with anionic polymers. The Bayesian methodology used provided accurate estimates and enabled a direct comparison between the fertilizers based on the marginal distribution of the von Bertalanffy model parameters. © 2025, Federal University of Lavras. All rights reserved.Item Comparison between coffee seedlings produced by traditional methods and from cryopreserved seeds(Associação Brasileira de Tecnologia de Sementes - ABRATES, 2026-03-30) Ricaldoni, Marcela Andreotti; Gontijo, Gabriela Ribeiro; Vilela, Ana Luiza de Oliveira; Pereira, Cristiane Carvalho; Souza, Ana Cristina de; Rosa, Sttela Dellyzete Veiga Franco daCoffee seeds are classified as intermediate, tolerating partial desiccation but being sensitive to low temperatures. They can be stored under cold conditions, allowing only short-term conservation. Cryopreservation overcomes these limitations, providing a viable method for long-term seed conservation and greater flexibility in seedling production. This study aimed to evaluate the development of coffee seedlings from cryopreserved seeds, comparing them with seedlings from seeds stored under cold (10°C) and dry (50% relative humidity) conditions. Seeds of the ‘Catuaí Amarelo’ IAC 62 cultivar were harvested at 42% moisture content (wet basis, wb) and subjected to four treatments: drying in a stationary dryer to 12% (S1) or 32% (S2) wb and stored in cold conditions; drying to 17% wb in saturated NaCl solution (S3) or silica gel (S4) and stored in liquid nitrogen. After six months, germination and tetrazolium tests were performed to assess physiological quality. Seeds were then used for seedling production in a nursery and greenhouse, where height, shoot diameter, number of leaves, leaf area, and shoot and root dry weight were evaluated. S1, S2, and S4 seeds showed similar results across most physiological variables, while S3 consistently exhibited lower performance. Overall, seedlings grown in the greenhouse exhibited greater vegetative development than those produced in the nursery.Item Influence of humus on chromium absorption by coffee seedlings grown on substrate containing tannery sludge(Universidade Federal de Viçosa, 2023-03-10) Berilli, Sávio da Silva; Oliveira, Dhiego da Silva; Martineli, Leonardo; Pereira, Lucas Louzada; Cunha, Maura Da; Pireda, SauloChromium is present in the tannery sludges worldwide making it a problem for agriculture. This study aimed to evaluate whether humus functions as a chromium stabilizing agent when using tannery sludge in the substrate of conilon coffee seedlings (Coffea canephora) and to determine what effects there are on leaf development and anatomy. Treatments consisted of a fixed dose of tannery sludge (30% of volume) on substrates of conilon coffee seedlings with different proportions of humus and subsoil (T-10, T-20, T-30, T-40% of humus). Information for the evaluation of leaf anatomy and seedling development was collected at 180 days after the planting of cuttings. From the phenological point of view, the treatments that best promoted seedling quality were T-30 and T-40. However, the greater the amount of humus in the substrate the greater the absorption of chromium by plants, which directly affected the organization of epidermal cells and leaf mesophyll. In addition, intense cytoplasmic degradation, ultrastructural changes in chloroplasts and mitochondria, and an increase in autophagic vacuoles were observed. We conclude that increasing the amount of humus in substrate with tannery sludge provides higher quality coffee seedlings, despite promoting greater absorption of chromium by plants and the consequent major intracellular disturbances.Item Detection of the fruit ripeness stage in the pre-harvest of Coffea arabica(Empresa Brasileira de Pesquisa Agropecuária - Embrapa, 2025-11-28) Bastos, Flávia de Souza Veronezzi; Pereira, Inara Almeida; Melo, Bruno Manoel Rezende de; Ferreira, Sindynara; Kloss, Rodrigo Barbosa; Santos, Telma Miranda dosThe objective of this work was to determine the optimal number of plants to be sampled and which method best represents the green-maturation stage of the Catuaí Vermelho IAC 144 and Mundo Novo IAC 376-4 Coffea arabica cultivars. The experimental design consisted of four treatments: harvest of the fruits located in the central bud of 12 plagiotropic branches; harvest of the fruits located in the first bud, central bud, and last bud of 12 plagiotropic branches; harvest of all fruits of 12 plagiotropic branches; and harvest of all fruits of the plant. Both coffee cultivars were subjected to all treatments, with the respective evaluation of the percentage of green fruits. For the two cultivars, the first, second, and fourth treatments adequately represent the percentage of green fruits of the crop. It is recommended to use the collection of fruits from the central bud of the plagiotropic branches to determine the percentage of green fruits of both cultivars. For the Catuaí Vermelho IAC 144 and Mundo Novo IAC 376-4 cultivars, the optimal number of plants to be sampled to quantify the green phenological stage is 13 and 14, respectively.Item Productivity, chemical and sensory characteristics of arabica coffee under different water regimes in the Brazilian Cerrado Central Plateau(Empresa Brasileira de Pesquisa Agropecuária - Embrapa, 2025-08-18) Celestino, Sonia Maria Costa; Silva, Patrícia Carvalho; Ramos, Maria Lucrécia Gerosa; Silva, Nathalia Henriques da; Brasileiro, Lemerson de Oliveira; Rocha, Omar Cruz; Malaquias, Juaci Vitória; Ribeiro Junior, Walter QuadrosThe objective of this work was to evaluate arabica coffee (Coffea arabica) under irrigation regimes in the Brazilian Cerrado Central Plateau regarding productivity, chemical quality of raw grains, and sensory quality of the beverage. The experiment was conducted in 2020/2021, with the regimes consisting of two levels of replacement, 100% and 50% of water requirement: irrigation throughout the year, water deficit from April to September, and water deficit from June to September. The chemical characteristics studied were: soluble solids, sucrose, trigonelline, caffeine, caffeoylquinic and citric acids. Sensory analysis was performed by SCA. The regimes of water replacement 100% with irrigation throughout the year and water deficit from June to September present higher productivity of arabica coffee in 2020 and 2021. In regimes with greater water restriction, the levels of sucrose and trigonelline in raw grains increase. In regimes with greater water replacement, the level of citric acid in the raw grains increases. Both regimes with a water deficit from June to September with 100% and 50% of the crop water requirement produce a beverage of excellent quality due to greater uniformity in grain maturation. With 50% of the crop water requirement, the water deficit from April to September is harmful to the quality of the beverage compared to the water deficit from June to September due to the period of two additional months in water stress.Item Enhancing genetic gains in conilon coffee through intra-population recurrent selection in Espírito Santo, Brazil(Universidade Federal de Santa Maria, 2025-08-25) Comerio, Marcone; Senra, Joao Felipe de Brites; Ferrão, Maria Amélia Gava; Dalvi, Leandro Pin; Verdin Filho, Abraão Carlos; Volpi, Paulo Sérgio; Fonseca, Aymbiré Francisco Almeida da; Ferrão, Romário Gava; Silva, Josimar Aleixo da; Rodrigues, Wagner Nunes; Posse, Sheila Cristina Prucoli; Maciel, Laiane Silva; Tomaz, Marcelo AntonioRecurrent intrapopulation selection is a key approach for the plant breeding of Coffea canephora, enabling the development of progenies superior to their parents while preserving genetic variability. This study was conducted in Espírito Santo, a major Conilon coffee production hub in Brazil, across two environments with contrasting soil and climatic conditions. This study to evaluated the agronomic performance, selection gains, and genetic divergence of 56 hybrid progenies from a late-maturing population, along with six parental plants. Genetic parameter estimates confirmed the presence of genetic variability and selection potential among the genotypes. Using Mulamba and Mock and Additive selection indices, 16 promising progenies were identified for the development of new cultivars. The strategy proved effective in recommending high-yielding genotypes adapted to each environment, highlighting its importance for sustainable cultivation under diverse edaphoclimatic conditions.Item Trolox equivalent antioxidant capacity of Coffea arabica L. seeds(Editora UFLA, 2022-08-08) Ferreira, Iara Alves; Fávaris, Nathália Aparecida Bragança; Rosa, Sttela Dellyzete Veiga Franco da; Coelho, Stefânia Vilas Boas; Ricaldoni, Marcela Andreotti; Costa, Marina ChagasThe causes of the low desiccation tolerance and low longevity of coffee seeds have not yet been fully elucidated, and a full understanding of their complex physiology is of great interest. Among several alternatives, the loss of antioxidant capacity in seeds may be related to their rapid loss in quality during storage. The objective of this study was to determine the total antioxidant capacity of coffee harvested at different ripeness stages before and after the storage of seeds with different water contents and to relate antioxidant capacity to physiological quality. Seeds in the greenish-yellow or cherry stages, recently harvested or stored for nine months at 10 °C with 40, 30, 20 and 12% water content (wet basis - wb), were submitted to physiological and biochemical quality evaluations, and the Trolox equivalent antioxidant capacity (TEAC) was determined. The germination and root protrusion of coffee seeds from greenish-yellow and cherry fruits were not affected by drying, but seeds harvested at physiological maturity had greater vigor when the moisture content was lower. The quality of coffee seeds decreased during storage, and this decrease was greater in seeds stored with higher water contents. Coffee seeds in the greenish-yellow stage had a higher antioxidant capacity than those in the cherry stage when recently harvested, but there was a substantial reduction in this capacity during storage at both maturation stages. Coffee seed deterioration is related to a reduction in antioxidant capacity, and the isoenzymatic profiles of the antioxidant process are little affected by the seed maturation stage. The deterioration of coffee seeds during storage is related to a reduction in their total antioxidant capacity, regardless of their maturation stage, being more pronounced in the greenish-yellow stage.Item Nutritional characteristics of conilon coffee genotypes grown in transition altitude with water management in soil(Editora UFLA, 2021-12-06) Salles, Rodrigo Amaro de; Jordaim, Renan Baptista; Colodetti, Tafarel Victor; Rodrigues, Wagner Nunes; Amaral, José Francisco Teixeira do; Tomaz, Marcelo AntonioThe modification of water management in the Conilon coffee (Coffea canephora) crop is a possible strategy to improve nutritional management efficiency and ensure better use of the genotypes for regions of transitional altitude. The objective of this study was to evaluate the nutritional characteristics of 27 genotypes of C. canephora and submit them to two water management schemes in soil. The goal was to find evidence of higher leaf contents, exports, and nutrient recycling potential in the productive branches of various genotypes. The experiment was carried out in a randomized block design with three replications in a split-plot scheme. The treatment consisted of 27 genotypes of C. canephora and two water management schemes in soil (“Irrigated” and “Rainfed”). Nutritional content in leaves, exported by fruits, and pruned (leaves and stem of plagiotropic branches) recyclable contents were evaluated for nitrogen, phosphorus, potassium, calcium, and magnesium. Variations were observed among genotypes for all the parameters evaluated in both water management in soil. However, significant homogeneous groups were formed among the genotypes in the irrigated management. Furthermore, the genotypes showed distinct nutritional characteristics in response to water management in the soil. Genotypes 108 and 302 had higher nutritional content and were exported by fruits, regardless of soil water management.Item Physiological quality of Arabica coffee seeds treated with essential oils(Instituto Internacional de Ecologia, 2026-02-02) Coelho, A. P. F.; Araujo, E. F.; Souza, R. A. de; Freitas, M. R. de; Silva, C. S. da; Pedrosa, A. W.; Lisboa, C. F.; Araujo, R. F.The preservation of Coffea arabica L. seeds is essential to obtain vigorous and healthy seedlings, but there are no registered fungicides for their phytosanitary treatment during the storage phase. Therefore, essential oils appear as promising alternatives due to the presence of bioactive compounds with potential antimicrobial action, in addition to contributing to the sustainability of the production chain. This study aimed to evaluate the physiological quality of Arabica coffee seeds treated with different essential oils during storage. Six essential oils (Rosmarinus officinalis, Cymbopogon citratus, Cymbopogon winterianus, Syzygium aromaticum, Eucalyptus globulus and Melaleuca alternifolia), a synthetic fungicide (TECTO®) and a control were used, subjected to five storage periods (0, 3, 6, 9 and 12 months). The physiological quality of the seeds was verified by means of standard germination and vigor tests: moisture content, germination, accelerated aging, seedling emergence and emergence speed index. There was a significant interaction between treatments and storage time for all variables analyzed. The essential oils of Rosmarinus officinalis and Cymbopogon winterianus preserved seed germination and vigor for up to nine months, a performance similar to that of the synthetic fungicide. Thus, these oils stand out as viable alternatives to the conventional fungicide treatment of Arabica coffee seeds.Item Fruit development and maturation in clones of Coffea canephora implanted in south Amazonas(Instituto Internacional de Ecologia, 2026-02-09) Lima, O. A.; Relvas, R. M. S.; Silva, E. P.; Araujo, O. P.; Souza, M. N.; Silva, I. S.; Pautz, C.; Carneiro, A. S.; Moutinho-Filho, M. D.; Santos, M. F. C.; Souza, M. S.This study aimed to evaluate fruit maturation of Coffea canephora cultivated in the southern region of Amazonas, focusing on the crop's phenological stages, which were introduced for the first time in Humaitá-AM for production trials. The experiment was conducted at the Mangabeiras Experimental Farm, part of the Institute of Education, Agriculture and Environment (IEAA) of the Federal University of Amazonas (UFAM), Humaitá campus. A randomized block design with four blocks and eight replicates per block was used. Each plot consisted of 14 rows, with 4 border plants. Evaluations began the main flowering event on September 3, 2021, and continued until June 2022. The phenological stages assessed were: pinhead, fruit expansion, green bean, light green (verde cana), cherry, and raisin. These stages were analyzed as percentages based on a selected branch. Clones were grouped by maturation time: intermediate (BRS 1216, BRS 2299, BRS 3210, BRS 3213, BRS 3220, Clone 12, RO C160, Clone 09, Clone 15), late (BRS 2314, BRS 2336, BRS 2357), and early (BRS 3137, BRS 3193). The pinhead and fruit expansion stages occurred from September to December, followed by fruit filling from January to April. In May, the light green stage was observed, coinciding with rapid fruit development under average temperatures of 26 °C and precipitation of 130 mm. These environmental conditions favored maturation, allowing fruits to reach the cherry stage by the end of the evaluation period.