<p>Drying is a fundamental step in post-harvest handling of coffee because moisture content at the end of drying affects several important aspects, such as sensory quality, storability, and color. Within this context, the aim of this study is to determine water distribution within the natural coffee fruit during and at the end of the drying process. For that purpose, simulations were made through finite elements using computational fluid dynamics. Experimental data on moisture content of coffee fruitin the “cherry” stage were collected during drying, which was carried out at a temperature of 40°C and relative humidity of 25% to 0.18 decimal(dry basis – d.b.)to compare the results of the experiment with the results of the simulations. Ten mathematical models of the drying process were developed for the collected data. The two-term exponential model best fit the data. The results of the simulations in computational fluid dynamics were compared to the results from experimental drying, and a satisfactory fit was obtained. The effective diffusivity coefficient (D<sub>eff</sub>) was developed for the model, obtaining the value of 2.87 x 10<sup>‑11</sup> m<sup>2</sup> s<sup>-1</sup>. At the end of drying, the model exhibited 57.1% of the projection area of the coffee fruit with moisture content below 0.18 decimal (d.b.). Thus, the model can be used for other applications.</p>
RESUMENEl cultivo de brachiaria se ha utilizado ampliamente para la implantación de áreas de pasto en sistemas integrados, utilizando fertilización con nitrógeno retardada bajo cubierta para la siembra de maíz. Sin embargo, la mezcla de fertilizantes como la urea promueve una disminución en la calidad fisiológica de la semilla con el tiempo de mezcla. El objetivo de este trabajo fue evaluar los períodos de exposición de las semillas de Brachiaria ruziziensis al contacto prolongado con urea, en tres proporciones de mezcla con fertilizante bajo la viabilidad de la semilla y el vigor de las plántulas. En un experimento de diseño completamente al azar, se evaluó el efecto de seis tiempos (3, 6, 12, 24, 48 y 72 horas) a tres niveles de urea (50, 100 y 150 kg de N ha -1 ) sobre la calidad fisiológica de las semillas. Se verificó el efecto negativo del tiempo y las proporciones de fertilizantes sobre la germinación y el vigor de las semillas. El mayor efecto negativo de la exposición de las semillas a la urea, con aumentos en la inviabilidad de las semillas y disminución de las plántulas normales, ocurre en altas proporciones de fertilizante con semillas y tiempo de mezcla hasta su uso. PALABRAS-LLAVE: Urochloa ruziziensis; Tecnología de semillas; calidad fisiológica. SEMENTES DE BRACHIARIA RUZIZIENSIS SOB DIFERENTES TEMPOS DE CONTATO E NÍVEIS DE MISTURA COM UREIA PARA FORMAÇÃO DE PASTAGEMRESUMO A cultura da braquiária tem sido amplamente utilizada para implantação de áreas de pastagem em sistemas integrados, usando-se para sua semeadura, de forma defasada no milho, adubos nitrogenados em cobertura. Contudo, a mistura de fertilizantes, tais como a ureia, promove um declínio na qualidade fisiológica das sementes ao longo do tempo de mistura. Objetivou-se com o trabalho, avaliar períodos de exposição de sementes de Braquiária ruziziensis ao contato prolongado
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