Universidade Federal de Viçosa

About: Universidade Federal de Viçosa is a education organization based out in Viçosa, Brazil. It is known for research contribution in the topics: Population & Biology. The organization has 16012 authors who have published 26711 publications receiving 353416 citations.

Physiological and Agronomic Performance of the Coffee Crop in the Context of Climate Change and Global Warming: A Review.

Abstract: Coffee is one of the most important global crops and provides a livelihood to millions of people living in developing countries. Coffee species have been described as being highly sensitive to climate change, as largely deduced from modeling studies based on predictions of rising temperatures and changing rainfall patterns. Here, we discuss the physiological responses of the coffee tree in the context of present and ongoing climate changes, including drought, heat, and light stresses, and interactions between these factors. We also summarize recent insights on the physiological and agronomic performance of coffee at elevated atmospheric CO2 concentrations and highlight the key role of CO2 in mitigating the harmful effects of heat stress. Evidence is shown suggesting that warming, per se, may be less harmful to coffee suitability than previously estimated, at least under the conditions of an adequate water supply. Finally, we discuss several mitigation strategies to improve crop performance in a changing w...

Spatially explicit valuation of the Brazilian Amazon Forest’s Ecosystem Services

Abstract: The Brazilian Amazon forest is tremendously important for its ecosystem services but attribution of economically measurable values remains scarce. Mapping these values is essential for designing conservation strategies that suitably combine regional forest protection with sustainable forest use. We estimate spatially explicit economic values for a range of ecosystem services provided by the Brazilian Amazon forest, including food production (Brazil nut), raw material provision (rubber and timber), greenhouse gas mitigation (CO2 emissions) and climate regulation (rent losses to soybean, beef and hydroelectricity production due to reduced rainfall). Our work also includes the mapping of biodiversity resources and of rent losses to timber production by fire-induced degradation. Highest values range from US$56.72 ± 10 ha−1 yr−1 to US$737 ± 134 ha−1 yr−1 but are restricted to only 12% of the remaining forest. Our results, presented on a web platform, identify regions where high ecosystem services values cluster together as potential information to support decision-making. This study spatially maps the economic value of some major ecosystem services provided by the Brazilian Amazon. It also estimates changes in these values under scenarios of degradation and low-impact logging.

Evaluation of spray drying conditions on properties of microencapsulated oregano essential oil

Abstract: Summary Response surface methodology (RSM) was employed to investigate variations in powder characteristics with respect to spray drying operating parameters including both feed rates (L min−1) and inlet temperatures (°C). Inlet temperatures around 180 °C provided the lowest values for moisture. Powder recovery was significantly affected (P 0.05) was observed for water activity, solubility and hygroscopicity between treatments. Regarding oil retention, the results showed a significant (P < 0.05) interaction between the two studied factors. A tendency for higher values of oil retention was observed when using combinations of high inlet temperatures/low feed rates and low inlet temperatures/high feed rates. Particle size distribution averaged 2.0, 8.1 and 18.3 μm for D10, D50 and D90, respectively. The morphology of particles showed no cracks in most capsules. The results indicate that high temperature (185 °C) and moderated feed rate (0.63 L min−1) are the best spray drying conditions.

Growth and yield of coffee plants in agroforestry and monoculture systems in Minas Gerais, Brazil

Abstract: This research compared coffee plants (Coffea arabica L.) grown in an agroforestry and monoculture systems. Data were collected during two years, on vegetative growth, reproductive development, nutritional status and yield of coffee, besides monitoring air temperature and the tree growth. All trees in agroforestry system increased in growth, resulting in a reduction in the magnitude of the diurnal temperature variation and also maximum temperature. Coffee plants in agroforestry system had less branch growth and leaf production, more persistent and larger leaves, and presented earlier flowering, with a smaller number of productive nodes and flower buds, leading to smaller berry yield than plants in monoculture system. In both systems, the coffee plants showed adequate leaf nutrient levels, except for P and K. The yield of 2443 kg ha-1 of coffee from the monoculture was greater than 515 kg ha-1 of coffee from the agroforestry system.