Impactos da deficiência de N, P, K, Mg e S em aspectos fisiológicos e de crescimento da orquídea Dendrobium bigibbum
DOI:
https://doi.org/10.1590/2447-536X.v31.e312930Palavras-chave:
condutância estomática, nutrientes, taxa fotossintética, taxa de transpiraçãoResumo
Dendrobium bigibbum é uma das principais orquídeas cultivadas e comercializadas no mundo. No entanto, ainda há escassez de informações acerca de suas necessidades nutricionais, resposta à deficiência individual de macronutrientes e os danos biológicos relacionados. O objetivo deste estudo foi avaliar os efeitos da deficiência de N, P, K, Mg e S nos aspectos fisiológicos, acúmulo de nutrientes, produção de matéria seca e sintomas em plantas de D. bigibbum cultivadas em soluções nutritivas. Sete tratamentos foram compostos por: uma solução nutritiva completa, e soluções com omissões individuais de N, P, K, Mg e S, além de uma solução somente de água (controle), organizados em blocos casualizados com 10 repetições. As mudas foram plantadas em vasos de polietileno de 1 dm³ preenchidos com vermiculita, e aclimatadas por 30 dias. Após esse período, iniciaram-se as aplicações de solução nutritiva, de acordo com os tratamentos, ao longo de 90 dias. As plantas de D. bigibbum, para um ótimo crescimento, apresentam as necessidades nutricionais de acordo com a seguinte ordem decrescente: K ˃ N ˃ Mg ˃ P ˃ S. Entretanto, a espécie é sensível à deficiência de N, P, K, Mg e S, o que prejudica a taxa fotossintética, a condutância estomática e a taxa de transpiração; e prejudica igualmente a produção de matéria seca das plantas, causando sintomas visuais característicos de cada deficiência de nutrientes.
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Copyright (c) 2025 Rubens Oliveira Meireles, Renato de Mello Prado, Renata Bachin Mazzini-Guedes, Rodolfo Inácio Nunes Santos, Rafael Gomes Viana, Vinicius Mendes Meireles, Raimundo Nonato Colares Camargo Júnior, Kathia Fernandes Lopes Pivetta
Este trabalho está licenciado sob uma licença Creative Commons Attribution 4.0 International License.
