Cobalt (Co) and molybdenum (Mo) are vital nutrients for biological fixation and nitrogen assimilation by soybean. This study aimed to evaluate the increase of Co and Mo contents in soybean seeds by leaf applications. The experiment was carried out in a seed production field in a 3 × 3 factorial scheme with three Co and Mo doses and three treatments (times). Each treatment consisted of two application times: R3+R5.1 (T1), R3+R5.4 (T2), and R5.1+R5.4 (T3). Doses were 0, 400, and 600 g.ha−1 of Mo and 0, 40, and 60 g.ha−1 of Co. No difference was observed for productivity, one thousand-seed weight, and germination. An interaction was observed between dose and application time in the Mo content. The application of 400 g ha−1 of Mo in T1 (R3+R5.1) provided a higher Mo content in the seeds (13.5 g.kg−1), which is 1350% higher when compared to the control. For Co, there was a difference only for doses, and the application of 40 or 60 g.ha−1 of Co increased seed nutrient content by 30%. Therefore, a higher enrichment of Co and Mo was observed in seeds with applications of 40 and 400 g.ha−1, respectively, applied in R3+R5.1.
O mogno africano (Khaya ivorensis) é uma espécie arbórea destinada à produção de madeira nobre. Apresenta elevado valor de mercado e boa adaptação edafoclimática à maior parte do território brasileiro. O objetivo do presente trabalho foi analisar a viabilidade econômica de plantio de mogno africano para produção de madeira nobre. Foi elaborado fluxo de caixa para um período de 20 anos. Os indicadores de viabilidade econômica calculados foram: valor presente líquido (VPL); taxa interna de retorno (TIR); payback; índice de rentabilidade e análise de sensibilidade, levando em consideração a variação de 60% para mais e para menos nos valores de investimento, receita e juros. O VPL calculado foi de R$ 11.296,72; a TIR 16%; o payback 19,92 anos; e o índice de rentabilidade foi de R$ 2,82 para cada R$ 1,00 investido. Na análise de sensibilidade, foi observado que apenas aumento acima de 15% nos juros, ou queda maior que 25% no valor da madeira tornaria o VPL negativo. Portanto, plantio de mogno africano é viável e apresenta baixa sensibilidade às variações do mercado.
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