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Food preservation is a widely discussed topic and target of uncountable studies. The present work evaluated the effect of a coating based on native cassava starch, gelatin, and chitosan over guavas (Psidium guajavas L.). The fruits, stored at 7 °C, were analyzed for 27 days regarding soluble solids (SS), titratable acidity (TA), ripening index (SS/TA ratio), vitamin C, and antimicrobial analysis. These analyses helped to evaluate the ripening process of coated and noncoated guavas. The results indicated that the coated guavas showed an increase of 9 days in their shelf life compared to the noncoated ones. It confirms that the biodegradable coating was able to decrease mass loss within the storage period. Moreover, the coating was remarkably effective in slowing the ripening process because, even after 27 days of storage, the fruits had not yet reached senescence. The biodegradable film was also capable of preventing microbial growth due to the antimicrobial capacity provided by chitosan.

The adoption of different fertilizer application methods should consider the operational, agronomic and economic aspects. The objective of this work was to study the fertilization response with potassium in the soybean crop at different times of application and different potassium sources in an Eutroferric Red Latosol. The experiment was carried out in the municipality of Formosa do Oeste-PR. The design was in a randomized block in a factorial scheme (2 × 5) +1, with 2 potassium sources: normal KCl (KCl) and polymer-coated KCl (KCl-polymer), the KCl doses were adjusted to 40 kg ha -1 of K2O, the second factor refers to the splitting of K2O dose in five application times: T1, application of K2O was nine days before sowing, T2 application split up being ½ of the dose nine days before sowing + ½ of the dose of K2O at sowing, T3 application of the total dose of K2O at sowing, T4 ½ of the dose at sowing + ½ at the V3 phenological stage of the crop, T5 application of K2O was total at the V3 stage of the crop. And an additional witness, without K2O application. KCl-polymer was more efficient for application to the haul before sowing the crop. The fertilization with KCl was better when applied at the V3 stage of the crop. Fertilization with KCl-polymer resulted in higher K content in the leaf, higher efficiency of fertilizer use reflecting in higher productivity.

No abstract

Os modelos atuais de agricultura e desenvolvimento em geral estão se mostrando insustentáveis, dadas suas bases em desperdício exacerbado, exaustão de recursos naturais, disposição errôneas de resíduos que causam graves danos ao meio ambiente. Devido a isso, faz-se necessária uma mudança de mentalidade na sociedade, passando do desenvolvimento irresponsável e visando somente o lucro, para uma postura de cautela com os recursos naturais e desprendimento do lucro desenfreado, através da sustentabilidade ambiental, isto é, a percepção de que o homem pertence ao meio ambiente, não o oposto. Sendo assim, o objetivo deste artigo é discutir e apresentar os conceitos introdutórios da produção orgânica e do mercado de orgânicos na perspectiva local e internacional. A construção do artigo passou-se pelos dados secundários e usou-se autores de renomes para as discussões a partir de 4 tópicos. Sendo, O conceito da agricultura orgânica; Histórico da agricultura e agricultura orgânica sob o olhar da agroecologia; Perfil dos consumidores de orgânicos no Brasil; Normas e regulamentos nacionais. Conclui-se que o Brasil não se configura nós 10 primeiros países com a maior área de produção orgânica na América do sul, mesmo ter aumentada a procura pelos produtos ecologicamente saudáveis, para tal, entende-se que ainda existem um longo caminho a seguir, principalmente na conscientização da população, visando um aumento na segurança alimentar de forma geral, já que a nutrição esta interconectada com a saúde como principal motivo da aquisição dos orgânicos.