O sistema de derruba e queima ainda é praticado na Amazônia, contribuindo para a destruição ambiental. Objetivou-se apresentar as perspectivas e realidades da agricultura de corte e queima na Amazônia, bem como suas relações envolvidas. Utilizou-se um levantamento bibliográfico para realização do estudo. Os agricultores persistem nesse sistema, por ser de baixo custo e de fácil adoção, em função da baixa fertilidade da maioria dos solos da região amazônica, do elevado custo de fertilizantes e corretivos. Os principais focos atuais de queimadas na Amazônia são associados à agricultura, em especial em escala familiar. As queimadas praticadas proporcionam danos ao ambiente, fauna e flora. Esse sistema mostra-se insustentável ainda presente no ambiente agrícola, principalmente na agricultura familiar da região Norte do Brasil, fator este agravante para a fauna e a flora local.

The jambu (Acmella oleracea) production can be influenced by the growing season and light available for metabolic processes. This study aimed to assess the agronomic and physiological performance of two jambu varieties, under different shading levels, during the winter and summer of the Brazilian Amazon. Two random block experiments were conducted, in a 2 x 4 factorial scheme, consisting of two jambu varieties (yellow and purple flower) and four shading levels (0, 30, 50 and 70 %), with four replications. Physiological, growth and yield traits were assessed. There was no significant interaction between treatments and growing seasons (Amazon winter and summer) for growth or yield traits, nor between treatments for the physiological characteristics. The cultivation without shading screen can increase the shoot dry weight of both varieties; the yellow flower variety exhibited early-onset flowering regardless of the shading screen used; the “Amazon summer” growing season increased the jambu yield by 33 %, while the 70 % shading reduced the net photosynthetic rate, consequently not favoring the vegetative development of the jambu plants. As such, it is recommended that the yellow and purple flower jambu varieties be grown without shading screen in the Amazon summer.

Eryngiumfoetidum exhibits low germination rates and heterogeneous seed maturation. Thus, in order to reduce problems during seedling production, a number of treatments can be used. The aim of this study was to assess the physiological quality of Amazon chicory seeds submitted to water immersion treatments. Two experiments were conducted, under controlled temperature (25 ºC) and nursery conditions, with six treatments (0, 12, 24, 36 and 48 hours) in each. A completely randomized design was used in the controlled condition and random blocks in the nursery. The following were assessed: germination/emergence speed index (GSI/ESI), mean germination/emergence time (MGT/MET), germination/emergence percentage, normal seedling development, fresh weight and dry weight. The data were submitted to linear and second-order polynomial regression analysis in the R statistical program. Under controlled conditions, Maximum GSI was 4.65 after 18.03 hours of immersion, and for MGT, 12 h of immersion provided a shorter average time (13.76 days) and obtained 39.26% of germinated seeds after 26.27 h of immersion, as well as 19.34% of normal seedlings in 27.97 h. In the nursery, a lower MET was observed after 48 h and mean fresh and dry weight were higher after 12 h (18.47 and 1.44 g, respectively). Thus, water immersion for 12 hours resulted in a shorter germination time and higher fresh and dry weight, and the treatment may have helped reactivate embryo metabolism and growth.

Climatic factors can decisively influence the growth and productivity of agricultural crops. For unconventional vegetables, such as the Amazon chicory, the influence of sunlight on growing cycle is unknown. The aim of this study was to evaluate the influence of shading levels on the productive performance of Amazon chicory. The authors used a randomized block design, with four treatments and five replicates. The treatments were black polypropylene screens, 30, 50 and 70% shading, and cultivation at full sunlight. Vegetative development and production traits were evaluated. Correlation and principal components analysis (PCA) were performed with the aid of the computer program R. No significant difference between the shading levels for the evaluated traits was noticed. Nevertheless, the cultivation at full sunlight allowed an increase in production, compared to the 70% shading screen. A strong positive correlation between productivity, leaf fresh mass and amount of water in the shoot area was verified, with a coefficient equal to 1. Only the leaf area characteristic was poorly correlated with other traits (angle >90º). Therefore, we suggest growing the Amazon chicory both at full sunlight and under 70% shading.

There are few recommendations for management of production and quality of propagules of Eryngium foetidum L. Thus, the aim of this study was to evaluate irrigation management during plant flowering and the harvest of different orders of inflorescences on the production and quality of E. foetidum propagules. For that purpose, a completely randomized experimental design was used in a 5 × 4 factorial arrangement consisting of five capitulum orders (1^st, 2^nd, 3^rd, 4^th, and 5^th orders) and four irrigation intervals (1, 2, 4, and 6 days). The following traits were evaluated: number of propagules, 1000-propagule weight, plant yield, first germination count, germination rate, hard propagules, relative frequency of germination, germination speed index, mean germination time, and mean time for seedling emergence in sand. After data collection, the means were compared using Tukey’s test (p < 0.05). To obtain higher yield and physiological quality of E. foetidum propagules, they should be produced under irrigation at a 4-day interval, and harvest should occur from the 1^st to the 5^th orders of the capitula.

Eryngium foetidum is a promising crop for diversifying agriculture and supporting sustainable development through nutrient-rich unconventional foods. However, limited knowledge about its seed viability and post-harvest management hinders its commercial scalability. This study explored the effects of post-harvest resting treatments on seed quality and vigor, assessing seeds from whole plants, aerial parts, floral spikes, and umbels after 7 and 14 days of resting. Key metrics included seed yield, purity, moisture content, germination, and vigor were assessed. Results showed that seeds retained on whole plants achieved the highest physical purity (72.2%). Seeds that rested for 7 days exhibited higher germination rates (59%), faster germination (mean germination time of 17 days), and improved seedling establishment (70% emergence) compared to seeds that rested for longer durations. These outcomes highlight the importance of specific post-harvest conditions for optimizing assimilate redistribution enhancing seed quality and seedling performance. This research bridges a critical gap in post-harvest management knowledge for E. foetidum, offering practical insights to improve cultivation practices and promote its adoption as a strategic crop. The findings align with global efforts to advance sustainable and innovative agroecosystems. Further studies under diverse environmental conditions and harvest times are recommended to validate these results and support large-scale implementation.