Efeito da aplicação foliar de silício na cv. Touriga franca na região demarcada do Douro - Bibliografia
Texto por: Lia-Tânia Dinis1,2, Natália Mota3, Sara Bernardo1,2, António Ribeiro4, José Moutinho-Pereira1,2
1 Centro de Investigação e Tecnologias Agroambientais e Biológicas (CITAB), Universidade de Trás-os-Montes e Alto Douro (UTAD)
2 Inov4Agro - Instituto de Inovação, Capacitação e Sustentabilidade da Produção Agroalimentar, Universidade de Trás-os-Montes e Alto Douro (UTAD)
3 Mestranda em Enologia e Viticultura - Escola de Ciências Agrárias e Veterinárias, Universidade de Trás-os-Montes e Alto Douro (UTAD)
4 Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança (IPB)
O clima quente e seco constitui um enorme desafio para a viticultura portuguesa manter os seus padrões de produtividade e qualidade. A escassez de recursos hídricos é limitante para a rega, tornando essencial adotar medidas alternativas de baixo-custo e ambientalmente sustentáveis, para mitigar os efeitos negativos FIGURA 1. Campo de ensaio em estudo com cv. Touriga Franca, no Douro Superior, Região Demarcada do Douro das mudanças climáticas. Neste estudo avaliou-se o efeito do silício na tolerância ao stresse estival na cv. Touriga Franca, numa vinha comercial na Região Demarcada do Douro. Os resultados revelaram que plantas com silício apresentaram uma taxa fotossintética superior às plantas não regadas e semelhante às plantas com rega deficitária (25% da ETc). À maturação, o tratamento com silício resultou em frutos com maiores valores de flavonóides, antocianinas, álcool provável, pH e brix°. Os resultados reforçam a ideia de que a aplicação de silício pode ajudar as plantas a tolerar o stresse estival e poderá ser uma alternativa eficaz às estratégias de rega deficitária.
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