The objective of this study was to evaluate the composition of OSB panels created using the Amazonian species Caryocar villosum Aubl., Erisma uncinatum Warm., and Hymenolobium excelsum Ducke. The OSB was produced using a phenol–formaldehyde adhesive at a ratio of 30:40:30 for each layer. Different mixtures of Amazonian wood and Pinus caribaea var. caribaea. were tested. Physical (water absorption and thickness swelling after 2 and 24 h of immersion in water and non-return rate in thickness) and mechanical (internal bond and parallel and perpendicular static bending) tests were performed. The OSB panels composed of wood mixtures absorbed less water after 2 and 24 h of immersion when compared to the OSB produced using pine wood. After 24 h of immersion in water, the T3 panel (40% Pinus caribaea + 40% Hymenolobium excelsum + 20% Caryocar villosum) presented the lowest absorption value. In terms of swelling in thickness at 2 h and 24 h, the panel composed of 100% pine strands showed the highest swelling value, while the T3 treatment exhibited the lowest swelling value at 2 and 24 h, as well as for the rate of non-return in thickness. Regarding mechanical properties, we observed that all panels exhibited similar resistance for both parallel and perpendicular Modulus of Rupture, as well as parallel and perpendicular Modulus of Elasticity, except for the internal bond, where T3 demonstrated the highest resistance. Additionally, some OSB panels met the requirements of the EN 300 standard for OSB panels.

Half of the Amazon Forest, which has a marked seasonality in rainfall, is susceptible to intense droughts caused by positive phases of the El Niño-Southern Oscillation (ENSO). Cedrela odorata L., sensitive to climate variations, emerges as a promising candidate for studies on how trees respond to climate change. Given the demand for its wood and the imperative for its protection in the Amazon Biome, applying the principles of environmental sustainability becomes crucial. This study characterizes local climatic variables near the Amazon River and assesses their impact, as well as the effect of ENSO, on the radial growth of Cedrela odorata using Pearson correlation analyses. Ring synchronization followed the standard methodology in dendrochronology, confirming common growth patterns and the formation of growth rings in C. odorata. Significant correlations with growth were noted concerning local climate, with negative associations for maximum and average temperatures and evapotranspiration, and a positive correlation with relative air humidity. ENSO exhibited a significant negative correlation with growth rings, indicating reduced growth during El Niño events. The species is notably sensitive to water availability, particularly at the onset of the growth period. The study concludes that the growth of C. odorata in the Óbidos-PA microregion responds to climate change.

A prática de adubação verde, que envolve o cultivo de espécies vegetais com características benéficas para o solo, destaca-se como uma estratégia eficaz para a melhoria da fertilidade do solo. O presente estudo teve como objetivo avaliar a produção de biomassa de três espécies indicadas para utilização como adubação verde (crotalária - Crotalaria juncea; mucuna preta - Mucuna aterrima; estilosante - Stylosanthes macrocephala). O trabalho foi realizado em Santarém, Pará com delineamento experimental em blocos intercalados, com oito repetições. A coleta de dados foi realizada 90 dias após o plantio e incluiu a medição da altura das plantas, massa fresca da parte aérea (MFPA), massa seca da parte aérea (MSPA), massa seca das raízes (MSR), massa seca total (MST), comprimento das raízes e diâmetro do colo da raiz. Observou-se que a crotalária se destacou em relação às demais espécies, apresentando a maior produção de biomassa fresca (1,43 ± 1,2 t/ha) e seca (0,46 t/ha e 0,21 t/ha) na parte aérea da planta. A mucuna preta se destacou para o comprimento de raiz com média de 33,2 cm. Esses resultados são de grande relevância para a agricultura sustentável, pois a adubação verde desempenha um papel fundamental na promoção da saúde do solo, na conservação dos recursos naturais e no aumento da produtividade agrícola. O cultivo de espécies como crotalária e mucuna preta poderá proporcionar benefícios significativos para os cultivos.

Food production in agroforestry systems (SAFs) has several advantages. The introduction of short-cycle species generates income in the first few years, which helps to maintain perennial species. Therefore, testing different cropping options in SAFs is important to reduce production costs and promote family food sovereignty. In this study, food production in SAFs was compared with a system without the consortium, called full sun (control treatment). The aim was to assess the profile and consumer perception of food from these farming systems. To this end, 37 questionnaires were administered to the target group of the university restaurant to evaluate samples of tubers (yams and purple yams – Dioscorea alata L. and Dioscorea trifida L.f) and the tuberous root (ginger – Zingiber officinale Roscoe.). The results showed that ginger and yam were widely known (100%), while yam was known by 78% of the participants. In terms of consumption, the percentages ranged from 19 to 38 per cent for the different species. When choosing which species to buy, anatomical characteristics such as colour, size and shape of the samples were important attributes in the final decision. Ginger and cará-roxo were well accepted in full sun, with percentages of 54 per cent and 72.9 per cent respectively. Yam, on the other hand, when grown in a consortium, achieved a significant percentage compared to the other options, reaching 37.8 per cent of preference.