Revista Brasileira de Ciências Agrárias
URI permanente para esta coleção${dspace.url}/handle/123456789/11110
Navegar
6 resultados
Resultados da Pesquisa
Item Caracterização de germoplasma de Coffea arabica L. com base em características agronômicas(Universidade Federal Rural de Pernambuco, 2024-10-01) Silva, Maria Gabriela Pereira e; Abrahão, Juliana Costa de Rezende; Nadaleti, Denis Henrique Silva; Pereira, Antônio Alves; Fassio, Larissa de Oliveira; Botelho, Cesar EliasGenetic resources embody the reservoir of essential natural variability for cultivated species breeding programs. The objective of this study was to select Arabica coffee accessions from the Minas Gerais Coffee Germplasm Collection grounded in agronomic traits. The productivity, quantified in bags per hectare, of 25 accessions was evaluated across four harvests, as was the percentage of maturation and floating beans. Genetic parameters were estimated for these attributes, aiming to glean insights into the potential for genetic gain and to facilitate decision-making in breeding practices. The REML/BLUP procedure was used to estimate variance components and predict random effects within the agronomic data. Genetic variability was observed among the studied accessions for productivity and the percentage of dried/pass fruits, indicating potential for genetic gain through selection within this group of accessions. There is potential for genetic breeding through selection, leading to subsequent enhancement in the means of the evaluated traits, notably in accessions MG0223 (Pacamara), MG0438 (Mundo Novo x S795 UFV 335-04), MG0194 (Caturra Amarelo Colombiano), MG0420 (Mundo Novo x S795 UFV 315-04), and MG0036 (Bourbon Amarelo). These results highlight the potential of these accessions to produce specialty coffees and their suitability for future breeding programs aimed at improving beans quality and productivity in Brazil.Item Sensory perception of coffee consumers as a function of different genotypes and extraction methods(Universidade Federal Rural de Pernambuco, 2024-09-30) Nadaleti, Denis Henrique Silva; Sousa, Maísa Mancini Matioli de; Ribeiro, Michele Nayara; Vilela, Diego Júnior Martins; Pereira, Dyanna Rangel; Carvalho, Gladyston RodriguesCoffee is one of the most consumed beverages in the world, with unique organoleptic characteristics of aroma and flavor, also varying according to the several extraction methods. Therefore, the objective of this study was to investigate whether the different Arabic coffee genotypes prepared by various extraction methods would influence amateur consumers’ perception of sensory and hedonic judgments of specialty coffee. A large-sample experiment (n = 270) was conducted in a coffee shop at the Universidade Federal de Lavras and participants were divided into three groups according to the evaluated genotypes (Bourbon Amarelo, Pacamara and Híbrido de Timor), who tasted four samples, varying to the extraction methods (‘Conventional Brewed’, Hario V60, French Press and Espresso). From the results obtained, it is possible to conclude that there is a change in the sensory perception of aromas and flavors of coffees in all genotypes studied in the four extraction methods, as well as in the acceptance and purchase intention by consumers.Item Efecto de técnicas de agricultura ecológica en microorganismo del ciclo del nitrógeno en suelos bajo cultivo de café(Universidade Federal Rural de Pernambuco, 2023-12-29) Bernal, Johan Alexander Bonilla; Cifuentes, Andrés Felipe Calderón; Avellaneda-Torres, Lizeth ManuelaLa agricultura ecológica promueve un sistema interactivo para la sostenibilidad del suelo y los agroecosistemas, aprovechando y optimizando los recursos disponibles para mejorar la calidad del suelo cultivado. La presente investigación tuvo objetivo evaluar los cambios físicos, químicos y en los microorganismos del ciclo del nitrógeno del suelo tras la aplicación de técnicas de agricultura ecológica como humus líquido, humus sólido, microorganismos eficientes, biol, gallinaza, fosfitos, estimulo del policultivos y abonos verdes, en cafetales de diferentes edades. Para dicha evaluación se realizaron muestreos durante los meses cero, cuatro y diez en parcelas de cafetales de cero, dos y cuatro años de siembra. Se determinaron parámetros fisicoquímicos y abundancia de microorganismos asociados al ciclo del nitrógeno (amonificantes (AMO), proteolíticos (PRO), oxidantes de amonio (BOA), oxidantes de nitrito (BON) y desnitrificantes (DEN). Los resultados evidenciaron cambios estadísticamente significativos producto de la aplicación de las técnicas de agricultura ecológica en el contenido de carbono orgánico, nitrógeno y fósforo del suelo. Estas diferencias estadísticamente significativas se dieron en los diferentes meses evaluados y en el mes 10 en contraste con el mes cero de aplicación de las técnicas. No obstante, no se encontraron cambios estadísticamente significativos en la abundancia de los microorganismos del ciclo del nitrógeno. Se obtuvieron relaciones directas entre variables como P y %OC; pH y DEN; BON y AMO. Se puede concluir que si bien la aplicación de técnicas de agricultura orgánica mejora las propiedades físicas y químicas de los suelos, no existen diferencias estadísticamente significativas en la abundancia de microorganismos del ciclo del nitrógeno.Item Transferência de mudas clonais de café do sistema convencional para o sistema hidropônico modificado(Universidade Federal Rural de Pernambuco, 2023-08-15) Cunha, Samuel Henrique Braga da; Lima, Amador Eduardo de; Carvalho, Alex Mendonça de; Guimarães, Rubens José; Teramoto, Érico Tadao; Freitas, Ana Flávia deCloning plants by cuttings, mineral nutrition via modified hydroponics and the use of alternative substrates emerges as technological innovations for seedling production. The objective in this study was to evaluate the transfer of cuttings from the conventional system to the modified hydroponic system. The following variables were analyzed: seedling lenght; number of shoots; shoot lengnt; total leaf number; number of remaining leaves; leaf area; root area; stomatal conductance, density, and functionality; stomatal opening; root volume, area, length and diameter; leaf area ratio; specific leaf area and weight of specific leaf matter. For statistical analysis, a completely randomized design (CRD) with 5 treatments, six replications and ten plants per plot was used. From the results obtained, it is possible to conclude that: the rooting of Coffea arabica cuttings is not necessary in a conventional system, and it can be performed directly in a modified hydroponic system; an adaptation in the proposed modified hydroponics system with nebulization in the environment is necessary for rooting, for the obtention of a higher quality seedlingItem Efectividad de un prototipo seleccionador de café cerezo con reconocimiento de imágenes usando machine learning(Universidade Federal Rural de Pernambuco, 2023-03-14) Valles-Coral, Miguel Angel; Bernales-del-Aguila, Carlos Ivan; Benavides-Cuvas, Elmer; Cabanillas-Pardo, LeninLa producción de cafés especiales es el objetivo principal de los caficultores a nivel mundial y depende de la selección de granos óptimos; sin embargo, especialmente en Latinoamérica, son procesados de manera manual y está influenciado por la subjetividad. El objetivo del artículo fue comprobar la efectividad de un prototipo seleccionador de café cerezo con reconocimiento de imágenes usando machine learning en tiempo real frente al método tradicional en la Asociación Valle Grande, Perú. Se empleó el procesamiento de redes neuronales covolucionales. Se entrenaron con el algoritmo YOLOv3 24.000 imágenes etiquetadas en el programa Labellmg de granos Catimor verde, maduro, pintón, sobre-maduro y seco. Los resultados describen el procedimiento de diseño y ensamblaje mecánico-electrónico del prototipo con las especificaciones técnicas necesarias para su replicación; además, demuestran su efectividad respecto a la reducción del tiempo de selección en 3 h aproximadamente, con un nivel de precisión del 94,00% en cuatro muestras de 100 kg de café. Se concluye que el prototipo es una alternativa potencial, reduciendo el costo, ahorrando tiempo y proporcionando una herramienta útil para garantizar la selección de granos que permita obtener calidad superior a 83 puntos SCAA.Item Agronomic performance, postharvest and indirect selection of Coffea arabica L. cultivars for high-temperature regions(Universidade Federal Rural de Pernambuco, 2020) Morello, Orlando Ferreira; Mingotte, Fábio Luíz Checchio; Leal, Fábio Tiraboschi; Coelho, Anderson Prates; Salvador Neto, Almir; Lemos, Leandro BorgesThis study aim was to evaluate the agronomic performance and the postharvest of small-sized Coffea Arabica cultivars and to indicate the best agronomic variable for indirect selecting genotypes for cultivation in high-temperature regions. The experiment was conducted during the 2014/15 harvest, employing the randomized blocks experimental design, with four replicates. The treatments consisted of 17 small-sized coffee cultivars. The evaluated attributes were growth, yield and postharvest of the coffee cultivars. Considering their morphological attributes, the cultivars Obatã IAC 1669-20, Catuaí Amarelo IAC 62, Obatã Amarelo IAC 4739 and IPR 99 were superior to the others. As for yield, the cultivars Obatã IAC 1669-20 (51.90 bags ha-1), Catuaí Amarelo IAC 62 (48.05 bags ha-1) and Catuaí Vermelho IAC 99 (47.63 bags ha-1) were superior. In the post-harvest evaluations, the cultivar Tupi IAC 125 (Tupi RN) had the best results. Due to their better agronomic performance, the cultivars Obatã IAC 1669-20 and Catuaí Amarelo IAC 62 are thus recommended for high-temperature regions. Plant height tends to be the best agronomic variable for indirect selecting more adapted cultivars for high-temperature regions.