Nitrous oxide is a potent greenhouse gas, with N fertilizers being one of its major sources. Plant growth-promoting bacteria have been used to mitigate N₂O emissions by improving N use efficiency in plants. In addition, some of these microorganisms are capable of reducing N₂O to N₂, a process that could be further explored as a complementary mitigation strategy. This study aimed to test whether Azospirillum brasilense strains Ab-V5 and Ab-V6, and strain Wa3, as well as Nitrospirillum viridazoti strain BR 11145, already used in commercial inoculants for N-fertilized crops and known to carry the nosZ gene encoding nitrous oxide reductase, could act as biological sinks for this gas. In the pot experiment, soils fertilized with N and inoculated with N. viridazoti exhibited consistently lower N₂O emissions, but not when A. brasilense strains were used. The mitigation effect was observed both in bare soil (72% emission reduction) and in the presence of millet plants (60% emission reduction), confirming the ability of N. viridazoti strain BR 11145 to consume N₂O. In a field experiment conducted with maize, inoculation with N. viridazoti again reduced N₂O fluxes during the first two weeks after fertilization compared with the urea-only treatment. However, no significant differences were detected comparing emission factors, whose calculation requires consideration of the entire monitoring period, thereby adding more variability. While N₂O mitigation was observed, no significant effects of inoculation or N fertilization were found on maize growth or yield. Nonetheless, the consistent reduction in N₂O emissions achieved with N. viridazoti strain BR 11145 suggests that inoculants with this bacterium represent a promising biological sink for N₂O, offering a novel nature-based solution to enhance the sustainability of tropical crop management.

Palm heart is considered a non-conventional vegetable, being extracted from a great number of palm tree species. In some species, extraction results in the death of the palm, due to the elimination of its apical meristem. Considering this situation and concerning about a possible extinction of such palm species, peach palm heart (Bactris gasipaes) can be considered an excellent alternative to reduce this extinction risk, since it is a precocious palm species, showing good tillering potential, being also rustic, and of excellent quality of palm heart (^{Fonseca et al., 2009}).

Este estudo realizou uma revisão bibliográfica sistemática para comparar criticamente a compostagem tradicional, a vermicompostagem e a gongocompostagem, destacando seu potencial de aplicação na agricultura. Foram avaliadas as vantagens e desvantagens de cada método com base em parâmetros técnicos e operacionais, como: (i) facilidade de manejo e preparo do composto; (ii) tempo total de processamento; (iii) demanda de mão de obra; (iv) tipos de resíduos orgânicos adequados (animais ou vegetais); (v) espaço físico necessário; (vi) agentes biológicos envolvidos (minhocas, gongolos, microrganismos); (vii) características físico-químicas e biológicas do composto final; e (viii) impactos no desenvolvimento vegetal (crescimento, produtividade e sanidade). Os resultados evidenciam as particularidades de cada técnica, oferecendo subsídios para a escolha do método mais adequado conforme recursos disponíveis e objetivos agrícolas.