Methods of potassium contents evaluation in the substrate solution and gerbera leaves

Author:

Ludwig Fernanda1ORCID,Fernandes Dirceu Maximino2,Guerrero Amaralina Celoto3,Ferreira Guilherme Amaral4ORCID,Pohlmann Valeria5

Affiliation:

1. Universidade Estadual do Rio Grande do Sul, Brazil

2. UNESP, Brazil

3. Sebrae, Brazil

4. Centro de Citricultura Sylvio Moreira – APTA, Brazil

5. Universidade Federal de Santa Maria, Brazil

Abstract

Abstract Several authors report that potassium (K) is the nutrient absorbed in greater amounts by gerbera plants. Thus, objective of determining the concentration of Kin the solution of substrates for growing potted gerbera, quantified by the Cardy Horiba C-131 and an atomic absorption spectrophotometer, correlating them with each other and with the plant leaf content. The experiment was carried out in a greenhouse. The experimental design was in randomized complete blocks using a 5×2 factorial scheme (5 substrates/2 cultivars) and four replications. Cherry and Red gerbera cultivar seedlings with four final leaves were transplanted into pots, filled with the substrates and acclimated for 30 days. After acclimation, the K content in the substrate solution extracted by the “PourThru” methodology was evaluated every two weeks using the Cardy Horiba C-131 portable ion meter and an atomic absorption spectrophotometer, as well as the K content in the leaves of gerbera plants. The solution of the commercial substrate had higher concentrations of K in relation to the others in the two forms of measurement, which is directly related to the high initial contents of the nutrient in this substrate. This is directly related to the high initial K contents in the substrate. Greater values of K were obtained for the cultivar Red, both in the solution and in the leaves. The K concentration of the substrate solution cultured with gerbera plants quantified by the Cardy Horiba C-131 and atomic absorption spectrophotometry correlated significantly with each other and showed a low correlation with the content of this nutrient in the plant tissue.

Publisher

FapUNIFESP (SciELO)

Subject

Horticulture,Plant Science

Reference32 articles.

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2. Instrução Normativa n. 17, de 21 de maio de 2007. Aprova os Métodos Analíticos Oficiais para Análise de Substratos e Condicionadores de Solos;Diário Oficial da União,2007

3. Monitoring and managing pH and EC using the PourThru extraction method;CAVINS T.J.,2000

4. Composição nutricional foliar da gérbera irrigada com efluente doméstico tratado;DAMASCENO L.M.O.;Revista Caatinga,2011

5. The physical properties of the substrates in horticulture;De BOODT M;Acta Horticulturae,1972

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