With the growing demand for efficient solutions to face the challenges posed by population growth and climate change, the use of unmanned aerial vehicles (UAVs) emerges as a promising solution for monitoring biophysical and physiological parameters in forage crops due to their ability to collect high-frequency and high-resolution data. This review addresses the main applications of UAVs in monitoring forage crop characteristics, in addition to evaluating advanced data processing techniques, including machine learning, to optimize the efficiency and sustainability of agricultural production systems. In this paper, the Scopus and Web of Science databases were used to identify the applications of UAVs in forage assessment. Based on inclusion and exclusion criteria, the search resulted in 590 articles, of which 463 were filtered for duplicates and 238 were selected after screening. An analysis of the data revealed an annual growth rate of 35.50% in the production of articles, evidencing the growing interest in the theme. In addition to 1086 authors, 93 journals and 4740 citations were reviewed. Finally, our results contribute to the scientific community by consolidating information on the use of UAVs in precision farming, offering a solid basis for future research and practical applications.

The effects of melatonin application by itself and mixed with sucrose solution on vase life and physicochemical changes in amaryllis cut flowers were investigated. Amaryllis stems with flower buds at harvest points were placed into vases containing different maintenance solutions: Melatonin (Mt; 0.01 mM), Sucrose (Suc; 4%), Melatonin + Sucrose (Mt + Suc; 0.01 mM + 4%) and distilled water (Control). Each treatment consisted of five repetitions, with one inflorescence stem per vase. The vases remained at 22 ± 3 °C and constant lighting of 13 µmol m^-2 s^-1 for 14 days. Immersion of stems in Suc or Mt + Suc delayed the initial senescence processes of the amaryllis cut flower. Vase life was prolonged for additional 2 days compared to stems immersed in water (control), increasing from 10 to 12 days of conservation. Floral stem mass was kept more stable; the degradation of anthocyanin and flavonoid pigments was delayed; and the stability of phenolic compounds and total carbohydrates was maintained for 14 days. These findings confirm the role of melatonin as a preservative in cut flowers. However, its preservative effect was potentialized by the addition of sucrose to the water of the amaryllis cut flowers. More work needs to be carried out to investigate the physiological mechanisms promoted by the interaction of melatonin and sucrose in the regulation of senescence in amaryllis cut flowers, including the analysis of gene expression and activity of the antioxidant system.

Cultivation conditions are determining factors that affect the quality of cut flowers. The objective of this study was to evaluate the vegetative growth, flowering and vase life of commercial gladiolus cultivars under different shading conditions in the Brazilian semi-arid region. Two cultivars of gladiolus (Jester and Rose Friendship) were grown under two conditions: full sun and 70% shade. Biometrics were evaluated 60 days after planting and the growth rate of the crop was evaluated at 15-30, 30-45 and 45-60 days for the variables: number of tillers, stem diameter, number of leaves and plant height. After 45 days, the fresh weight, dry weight and total relative water content of the area and root parts of the plants were evaluated. After the harvest, the stems were kept at a temperature of 22±3 °C and relative humidity (RH) of 60%. Visual assessment, pH of the solution, variation in the volume of water and loss of fresh mass were measured every two days. Cultivation with 70% shading resulted in greater accumulation of biomass in the aerial part of gladiolus plants, greater neck diameter and height. The Rose Friendship cultivar underwent a greater translocation of dry matter to the aerial part of the plants, resulting in greater height. On the other hand, the gladiolus stems from cultivation under full sun conditions resulted in longer vase life, 10 days under conservation conditions at 22±3 °C and RH 60%.

No brasil, a utilização de pastagens se constitui como a principal fonte de alimentar dos rebanhos. Contudo, em regiões semiáridas o emprego desse recurso pode ser limitado, principalmente pelas irregularidades climáticas, sendo necessário recorrer as pastagens cultivadas. Com isso, é imprescindível conhecer o valor nutricional dessas espécies, com vista ao estabelecimento de dietas balanceadas, maximizando a cadeia produtiva. Dessa forma, o objetivo desta revisão é apresentar as principais espécies cultivadas no semiárido, assim como evidenciar seus atributos bromatológicos, com vista ao aumento da sustentabilidade do sistema, assim como aumentar o desenvolvimento da cadeia produtiva nesses ambientes. Para isso, foi utilizada uma busca sistemática de artigos científicos em quatro plataformas sendo elas: Scielo, Google Scholar, Science direct e Scopus, prezando tanto qualidade como atualidade do tema em questão. O conhecimento da qualidade nutricional de uma espécie, além de incrementar o sistema produtivo, ainda o torna menos oneroso, uma vez que a combinação de espécies com diferentes atributos na alimentação pode fornecer o que o animal precisa em termos nutricionais, evitando a compra de alimentos concentrados.Palavras-chave: carboidratos, leguminosas, gramíneas, Nopalea, Opuntia, sustentabilidade. Nutritive value of forage plants cultivated in the brazilian semiarid region A B S T R A C TIn Brazil, the use of pasture is the main source of food for livestock. However, in semi-arid regions, the use of this resource may be limited, mainly due to climatic irregularities, making it necessary to use cultivated pastures. Thus, it is essential to know the nutritional value of these species, in order to establish balanced diets, maximizing the production chain. Thus, the objective of this review is to present the main species cultivated in the semi-arid region, as well as to highlight their bromatological attributes, with a view to increasing the sustainability of the system, as well as increasing the development of the production chain in these environments. For this, a systematic search of scientific articles in four platforms was used, namely: Scielo, Google Scholar, Science direct and Scopus, valuing both quality and timeliness of the topic in question. Knowledge of the nutritional quality of a species, besides increasing the production system, also makes it less expensive, since the combination of species with different attributes in the diet can provide what the animal needs in terms of nutrition, avoiding the purchase of concentrated feed. Keywords: carbohydrates, legumes, grasses, Nopalea, Opuntia, sustainability

Cacti of the genera Opuntia and Nopalea exhibit morphophysiological and biochemical characteristics that favor their adaptation to semiarid environments, such as crassulacean acid metabolism (CAM) and cladode succulence. These strategies reduce water loss and allow the maintenance of photosynthesis under stress conditions. In this study, we evaluated the seasonal variation in the physiological and photochemical responses of forage cactus clones grown in semiarid environments, considering the rainy, dry, and transition seasons. The net photosynthetic rate (P_n) and chlorophyll fluorescence parameters varied significantly as a function of water availability and microclimatic conditions. We found higher CO₂ assimilation rates during the rainy season, while the dry season resulted in a strong impairment of photosynthetic activity, with reductions of 65% in stomatal conductance, 37% in transpiration, 20% in maximum quantum efficiency of photosystem II, and 19% in the electron transport rate. Furthermore, during these periods, we observed an increase in initial fluorescence and non-photochemical dissipation, demonstrating the activation of photoprotective mechanisms against excess light energy. During the transition seasons, the cacti exhibited rapid adjustments in gas exchange and energy dissipation, indicating the adaptive plasticity of CAM pathway. The MIU (Nopalea cochenillifera (L.) Salm-Dyck), OEM (Opuntia stricta (Haw.) Haw.), and IPA (Nopalea cochenillifera (L.) Salm-Dyck) clones demonstrated greater resilience, maintaining greater stability in P_n, instantaneous water use efficiency, and photochemical parameters during the drought. In contrast, the OEA (Opuntia undulata Griffiths) clone showed high sensitivity to water and heat stress, with marked reductions in physiological and photochemical performance. In summary, the photosynthetic efficiency and chlorophyll fluorescence of CAM plants result from the interaction between water availability, air temperature, radiation, and genotypic traits. This study provides a new scientific basis for exploring the effects of environmental conditions on the carbon and biochemical metabolism of cacti grown in a semiarid environment.