Efeito da aplicação de ácido húmico e da pulverização com CPPU no crescimento e florescimento de tagetes
DOI:
https://doi.org/10.1590/2447-536X.v31.e312965Palavras-chave:
bioestimulantes, citocinina, forclorfenurão, melhoria da floração, Tagetes eretaResumo
Este estudo investigou os efeitos do ácido húmico (HA) e do forclorfenurão (CPPU) sobre o crescimento, floração e características químicas da calêndula (Tagetes ereta L.) durante a estação de crescimento de 2025 sob cultivo protegido. O experimento foi conduzido utilizando um arranjo fatorial com dois fatores: três concentrações de HA (0, 2 e 4 mL L-1) e quatro concentrações de CPPU (0, 4, 8 e 12 mg L-1). Foram medidos parâmetros de crescimento, características de floração e conteúdo bioquímico. A aplicação de HA melhorou significativamente todas as características avaliadas, com os maiores valores obtidos em 4 mL L-1, resultando em altura da planta (37,67 cm), número de ramos (6,84 planta-1), número de flores (7,88 planta-1), diâmetro da flor (6,68 cm), peso da flor fresca (0,83 g), clorofila total (1,54 mg g-1), carboidratos (6,38%), nitrogênio (1,65%), fósforo (0,37%) e potássio (1,79%). A aplicação de CPPU também melhorou significativamente o desempenho da planta. A concentração de 8 mg L-1 proporcionou a maior altura de planta (36,91 cm), número de flores (7,35 plantas-1), peso de flores frescas (0,87 g), clorofila total (1,48 mg g-1) e nitrogênio (1,66%), enquanto 12 mg L-1 resultaram em maior número de ramos (6,69 plantas-¹), diâmetro da flor (6,53 cm), teor de carboidratos (6,31%), fósforo (0,34%) e potássio (1,78%). Em conclusão, o uso combinado de ácido húmico e CPPU melhorou o crescimento vegetativo, o desempenho da floração e a composição bioquímica da calêndula, com as doses mais altas (4 mL L-1 HA e 8–12 mg L-1 CPPU) mostrando os efeitos mais benéficos. Estes resultados destacam o potencial do HA e da CPPU como estratégias eficazes de bioestimulantes e reguladores de crescimento para melhorar a produção de plantas ornamentais.
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Copyright (c) 2025 Ahmed Fatkhan Zabar Al-Dulaimy, Hiba Erheem ALfahdawi, Sumaya Husham Abdulhameed
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