Electrical conductivity and frequency of fertilizer application on the growth of the Brassia verrucosa lindley orchid
DOI:
https://doi.org/10.5433/1679-0359.2024v45n1p97Keywords:
Salinity, Fertigation, Orchidaceae, Plant nutrition.Abstract
Electrical conductivity and frequency of fertigation application to orchids have not been established. This study aimed to evaluate the influence of electrical conductivity and fertilizer application frequencies on Brassia verrucosa growth and nutrition. Brassia verrucosa seedlings were grown for 18 months. Urea, potassium chloride, and monoammonium phosphate diluted in three concentrations, that is, C1 (0.5:0.5:0.5, g L−1), C2 (1:1:1, g L−1), and C3 (2:2:2, g L−1) were used as sources of nitrogen (N), potassium (K), and phosphorus (P), respectively. The electrical conductivities reached values of 1.25, 2.5, and 4.7 mS cm−1, respectively. Three application frequencies were adopted: monthly (F1), fortnightly (F2), and weekly (F3). The control consisted of plants that were only irrigated. The experimental design was completely randomized with 10 replications, in a 3x3+1 factorial scheme. The photometric parameters and macronutrient content in the shoot were subjected to analysis of variance and Tukey’s test at a 5% significance. The conductivity of solutions resulted in higher increases over the phytometric variables. Increased electrical conductivity led to increments in Brassia verrucosa growth, as well as increases in N, P, and K contents. Conductivity C3 (4.7 mS cm−1) associated with fortnightly (F2) or weekly (F3) application frequencies increased the number of shoots
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