https://www.alice.cnptia.embrapa.br/alice/handle/item/22 Embrapa Meio Ambiente (CNPMA) 2026-05-20T23:17:36Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186756 Título: Temporal optimization of UAV-based pasture monitoring using multi-year NDVI and precipitation data in Lagoinha/SP, Brazil. Autoria: NOGUEIRA, S. F.; SANTOS, T. T.; BAYMA, G.; SANTOS, P. M.; SANO, E. E.; BOLFE, E. L. Conteúdo: This study identifies the optimal period for using unmanned aerial vehicle (UAV) imagery to assess pasture conditions in the municipality of Lagoinha, São Paulo State, Brazil. It combines long-term precipitation data (1948‒2024) and NDVI time series derived from Sentinel-2 satellite (2017‒2024) for 15 partner properties of the Science Center for the Development of Digital Agriculture - Semear Digital. The results show that the transition from rainy to dry season, especially in May and June, provides the best pasture contrast conditions for UAV monitoring. During this time, intermediate NDVI values (0.45‒0.55) enhance the differences between well-managed and degraded pastures, while lower precipitation and cloud cover conditions improve the radiometric quality of images. Farms with higher technology adoption show more stable NDVI profiles, facilitating the vegetation condition detection. This study provides a framework for planning UAV-based pastureland assessments to support better pastureland monitoring and management decisions. 2025-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186510 Título: Modulated UV-C radiation as an innovative strategy for postharvest disease control and quality preservation in papaya and orange fruits. Autoria: SILVA, A. M. da; TERAO, D.; SILVA, I. S. O.; MAIA, A. de H. N.; MELO, W. L. de B.; NECHET, K. de L.; HALFELD-VIEIRA, B. de A.; VILELA, E. S. D.; FRACAROLLI, J. A. Conteúdo: Abstract: Postharvest losses remain a major challenge in fruit production systems, affecting both climacteric fruits, such as papaya, and non-climacteric fruits, such as orange. Ultraviolet-C (UV-C) radiation has emerged as a sustainable alternative to chemical fungicides; however, its effectiveness depends on the applied dose and radiation delivery mode. This study investigated the comparative effects of continuous and frequency-modulated UV-C radiation on postharvest disease control and fruit quality on papaya and orange. Two independent experiments were conducted. Experiment 1 evaluated the influence of modulation frequencies (0, 15, 30, and 45 Hz) on disease progression, while Experiment 2 combined the most effective frequencies with different exposure times to define optimal treatment conditions. In papaya, UV-C modulation at 30 Hz/20 s (0.44 kJ m⁻²) provided effective control of anthracnose (67% reduction in incidence), while minimizing photothermal damage, with no visible epidermal injuries. In orange, continuous UV-C radiation (0 Hz) applied for 30 s (1.99 kJ m⁻²), completely suppressed sour rot development (100%) without visible peel injury. Therefore, the selection of the UV-C radiation application mode is species-specific. Notably, modulation of UV-C irradiation has demonstrated enhanced efficiency in postharvest disease control while reducing epidermal burn. Additionally, the treatments stimulated defense responses, as evidenced by increased activities of phenylalanine ammonia-lyase, polyphenoloxidase, peroxidase, and catalase. Physicochemical analyses confirmed the maintenance of firmness, acidity, and color stability, indicating the preservation of postharvest quality in both fruits. Overall, modulated UV-C radiation represents a promising non-chemical postharvest technology, enabling efficient disease control while maintaining fruit quality. 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186470 Título: Analysis of Drought Impact on Sugarcane Bagasse Based Electricity Generation under Climate Change Scenarios. Autoria: ZEBALLOS, J. C.; BUFON, V. B.; SEBESVARI, Z. Conteúdo: The Rio dos Patos Basin in the Cerrado Biome in Brazil is experiencing land use change from (degraded) pasture to sugarcane fields. While the Cerrado has a low share of land under sugarcane cultivation (2 %), it contains half of Brazil’s sugarcane area and presents the highest sugarcane expansion rate due to land availability, flat topography and climatological characteristics. Sugarcane in Brazil is a relevant crop for sugar and biofuel production and, nowadays increasingly, for electricity production. Electricity demand in Brazil is covered mostly by hydropower plants (65 %). However, during dry and low river discharge periods, thermal power plants (oil and natural gas) cover most of the gap (14 %). Some sugarcane mills had experience selling electricity surplus prior 2005, when the first auction to ‘new energies’ was held. Thereafter, electricity generation based on sugarcane bagasse covers 8 % of annual demand, mostly delivered during dry season. Recent unprecedented drought events in Brazil, showed the electricity production vulnerability to droughts. Drought risk assessments including weather trend analysis and climate change scenarios can help to identify regions at risk and help to point opportunities to better cope and adapt to future drought events. In this context, the potential of sugarcane bagasse based electricity generation was evaluated in the Rio dos Patos basin. Weather data from 36 stations within the area and downscaled climate change projections under RCP 4.5 showed a decrease on precipitation jeopardising water availability. Using the Soil & Water Assessment Tool (SWAT) two scenarios were modelled: 1) without sugarcane expansion and 2) with 45 % expansion to sugarcane suitable land. Drought impacts on sugarcane and electricity production will be discussed under the mentioned scenarios. Considering the biome susceptibility to similar drought events, it is important to consider different adaptation strategies for both, sugarcane crops and energy generation, towards energy and water security. 2019-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186480 Título: A meliponicultura e seu potencial para a conservação das abelhas sem ferrão: gargalos para o seu desenvolvimento: aspectos regulatórios e estruturais. Autoria: CAMARGO, R. C. R. de Conteúdo: RESUMO. A relação entre os povos tradicionais na América do Sul e América Central e as abelhas sem ferrão remonta ao período pré-colonização europeia, a partir da existência de inúmeros artefatos arqueológicos que comprovam como as abelhas e seus produtos eram considerados especiais para esses povos. 2015-01-01T00:00:00Z