Resposta de Ervatamia coronaria a fitorreguladores e adubação química
DOI:
https://doi.org/10.1590/2447-536X.v29i1.2514Palavras-chave:
ácido naftalenoacético, cinetina, NPK, Tabernaemontana coronariaResumo
O presente experimento foi conduzido para determinar o efeito das taxas de fertilização química e aplicação foliar de reguladores de crescimento de plantas PGRs (Cinetina ou Ácido Naftalenoacético (ANA) e suas interações no crescimento, floração, composição química de plantas de Ervatamia coronaria. as plantas foram fertilizadas mensalmente com NPK na dose de 2, 4 e 6 g/vaso, além das plantas controle. As plantas que receberam os tratamentos de fertilização foram pulverizadas mensalmente com cinetina ou ANA a 50, 100 ppm para cada uma, enquanto as plantas controle foram pulverizadas com água da torneira . Em geral, os resultados indicaram que, dentro de cada nível de tratamentos de fertilizantes, o tratamento de plantas com diferentes concentrações de PGRs (cinetina ou ANA) resultou em aumento significativo no crescimento vegetativo testado (em termos de altura da planta, número de ramos planta-1, área foliar , número de folhas planta-1, diâmetro do caule, comprimento da raiz, pesos frescos e secos de folhas, caules e raízes), parâmetros de floração (Viz número de flores planta-1, massa fresca e seca de flores), teor de clorofilas, carboidratos totais, N, P, K%, indóis totais e fenóis totais, giberelinas, auxinas e citocininas em relação ao controle, com superioridade de ANA principalmente nas concentrações mais altas (100 ppm). Sob o mesmo nível de PGRs o aumento da taxa de adubação causou um aumento gradual e significativo em todos os parâmetros testados em relação ao controle. Com base nos resultados, pode-se reco- mendar que, para os parâmetros de crescimento e floração da E. coronaria de maior qualidade, as plantas podem ser pulverizadas com ANA a 100 ppm combinado com 6 g/vaso de NPK.
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