Forages are one of the most cultivated crops in the world. However, nutritional deficiency is common, specifically in N, P, and Ca in many forage-growing regions. Silicon (Si) can attenuate the stress caused by nutritional deficiency, but studies on Si supply’s effects on forage plants are still scarce. This research was carried out to evaluate whether the Si supply can mitigate the effects of N, P, and Ca deficiencies of two forages and the physiological and nutritional mechanisms involved. Two experiments were carried out with two forage species (Urochloa brizantha cv. Marandu and Megathyrsus maximum cv. Massai). We used nutrient solution under balanced nutrition conditions and nutritional stress due to the lack of N, P, and Ca combined with the −Si and +Si. The deficiencies of N, P, and Ca in both forages’ cultivation caused damage to physiological and nutritional variables, decreasing the plant dry matter. However, in both forage species, the Si addition to the nutrient solution decreased the extravasation of cellular electrolytes and increased the content of phenolic compounds, the green colour index, the quantum efficiency of photosystem II, the efficiencies of use of N, P and Ca and the production of shoot dry matter. The beneficial effects of Si were evidenced in stressed and non-stressed plants. The research emphasised the advantage of using Si to grow U. brizantha and M. maximum under N, P, and Ca deficiency, contributing to their sustainable cultivation.
Forages are one of the most cultivated crops in the world. However nutritional deficiency is common, specifically in N, P and Ca in many forages growing regions. Silicon (Si) can attenuate the stress caused by nutritional deficiency, but studies on the effects of Si supply on in forages plants are still scarce. This research was carried out to evaluate whether the Si supply can mitigate the effects of N, P and Ca deficiencies of two forages and the physiological and nutritional mechanisms involved. Two experiments were carried out with two forage species (Urochloa brizantha cv. Marandu and Megathyrsus maximum cv. Massai). Was used nutrient solution under balanced nutrition conditions and nutritional stress due to the lack of N, P and Ca combined with the -Si and +Si. The deficiencies of N, P and Ca in both forages cultivation caused damage to physiological and nutritional variables, hence decreasing the plant dry matter. However, in both species forages the addition of Si to the nutrient solution decreased the extravasation of cellular electrolytes and increased the content of phenolic compounds, the green color index, the quantum efficiency of photosystem II, the efficiencies of use of N, P and Ca and the production of shoot dry mass. The beneficial effects of Si were evidenced in stressed and non-stressed plants. The research emphasized the advantage of using Si for the growth of U. brizantha and M. maximum under N, P and Ca deficiency, contributing to their sustainable cultivation.
3Instituto Federal do Pará -IFPA. RESUMO:Este trabalho busca dialogar com o pensamento descolonial na educação a partir da experiência do Curso Técnico em Agroecologia do Campus Rural de Marabá, do Instituto Federal do Pará. Neste curso o itinerário formativo é constituído por dois tempos de estudo: o Tempo Escola e o Tempo Aldeia, caracterizado como "alternância pedagógica". Tal lógica parte do estudo da realidade "concreta", possibilitando aos educandos articulação dos conhecimentos tradicionais e os técnico-científicos relacionados às dimensões políticas, históricas, naturais. Nossa estratégia pedagógica adotada no CTAI se aproxima em parte da proposta de educação descolonial e o tempo aldeia se mostrou central na estratégia de se pensar e repensar formas de educação "outras" aquelas da modernidade.Palavras-chave: Agroecologia, Alternância, Interculturalidade, Currículo.
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