The development of approaches to determine the spatial variability of nitrogen (N) into coffee leaves is essential to increase productivity and reduce production costs and environmental impacts associated with excessive N applications. Thus, this study aimed to assess the potential of the Random Forest (RF) machine learning method applied to vegetation indices (VI) obtained from Remotely Piloted Aircraft (RPA) images to measure the N content in coffee plants. A total of 10 VI were obtained from multispectral images by a camera attached to a rotary-wing RPA. The RGB orthomosaic was used to determine sampling points at the crop area, which were ranked by N levels in the plants as deficient, critical, or sufficient. The chemical analysis of N content in the coffee leaves, as well as the VI values in sample points, were used as input parameters for the image training and its classification by the RF. The suggested model has shown global accuracy and a kappa coefficient of up to 0.91 and 0.86, respectively. The best results were achieved using the Green Normalized Difference Vegetation (GNDVI) and Green Optimized Soil Adjusted Vegetation Index (GOSAVI). In addition, the model enabled the evaluation of the spatial distribution of N in the coffee trees, as well as quantification of N deficiency in the crop for the whole area. The GNDVI and GOSAVI allowed the verification that 22% of the entire crop area had plants with N deficiency symptoms, which would result in a reduction of 78% in the amount of N applied by the producer.

Due to the importance of the flower and ornamental plants sector in Brazilian agribusiness, studies that analyze the situation of its different segments can help to understand and establish policies and actions that support and stimulate their development. The objective was to analyze the profile and behavior of consumers in the productive chain of flowers and ornamental plants. For this, a questionnaire with direct questions was prepared and directed to consumers of flowers and ornamental plants. The application was made personally with direct approaches in places of great movement and specialized technological fairs, and also online through social media, using Google platform. The results were analyzed by comparing qualitative variables using the Chi-Square test. It was identified that the profile of consumers is concentrated in women who live in large cities, consuming an average of R$ 100.00 to R$ 200.00 over a period of one year.

The importance of segment of flowers and ornamental plants in agribusiness are growing. Researches that analyze the situation of different sector of this segment may contribute to establishing politics and actions to stimulate its development. In order to attend this purpose, the aim of this research was to analyze segments of the flower and ornamental plant production chain, focusing on producers and retailers. For that, two different surveys were applied, composed of direct and indirect questions. The application was performed online, using social media or in person, in the company location or in trend fairs. It was observed that the flower and ornamental plant production is mainly a familiar business. Another important issue is that the springtime consists of a new date for flower and ornamental plant commercialization. The number of retailers has been increasing, and this segment had some improvements as sales of different products and services. The flower and ornamental plant commercialization are still, in the majority, in physical location shops, besides of all the technologies available for online sales.

Resumo O objetivo deste trabalho foi avaliar o conhecimento sobre cuidados paliativos de estudantes do quarto, quinto e sexto anos da graduação em medicina de uma faculdade particular de Belo Horizonte, bem como investigar sua percepções sobre o ensino do tema. Trata-se de estudo transversal observacional com aplicação de questionário on-line para 135 acadêmicos. Dentre os participantes, 40,7% consideram-se preparados para lidar com morte de pacientes e luto dos familiares, 80,7% classificam o próprio nível de conhecimento sobre cuidados paliativos como regular e 77% afirmam não ter recebido informações suficientes sobre o assunto. Ao avaliar conceitos, 20% tiveram desempenho insatisfatório, 48% aceitável e 3% excelente. Acadêmicos de anos mais avançados e que fizeram o internato em saúde do idoso apresentaram melhores respostas. Revelou-se que, apesar de o desempenho dos estudantes ser em geral regular, o internato em saúde do idoso tem impacto positivo na aquisição de conhecimento sobre cuidados paliativos.

The objective of this work was to evaluate the viability of the micrografting of yellow dragon fruit (Selenicereus megalanthus) on different rootstocks, based on DNA content and anatomical analyses. The used rootstocks were: yellow dragon fruit, white dragon fruit (Hylocereus undatus), Saborosa (Selenicereus setaceus) dragon fruit, and the Cebra and Orejona red dragon fruit (Hylocereus polyrhizus) varieties. The experimental design was completely randomized with five treatments and four replicates of five plants. After 30 days of cultivation, the following traits were evaluated: length and diameter of the micrografts and microrootstocks; and root length, percentage of setting, and fresh mass of the micrografts. Flow cytometry analyzes were performed before and after micrografting to verify genetic stability and the occurrence of endoreduplication. In addition, histological sections were made in the micrografting region to verify the connections of vessels and tissues between the graft and the rootstock. Endoreduplication was observed in all treatments. The amount of DNA in the yellow dragon fruit micrograft increased on the red Orejona variety. The presence of vessel connections was verified between the micrografts and microrootstocks. The yellow dragon fruit was also more vigorous when grafted on Orejona. Based on DNA content and anatomical analyses, in vitro yellow dragon fruit micrografting is feasible in all used rootstocks.