Abstract

OLIVEIRA DA SILVA, Deyse Cristina et al. Leaf fertilization in nutritional supplementation of micropropagated pineapple cultivars. Investig. Agrar. [online]. 2020, vol.22, n.1, pp.22-29. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2020.junio.22-29.

Although there are already available pineapple cultivars resistant to fusariosis, Brazilian production is based on the cultivar Pérola, susceptible to fusariosis. Studies with these resistant cultivars should prioritize the fulfillment of nutritional requirements, so that they express their productive potential and become viable options for producers. The objective of this study was to study the effects of foliar fertilizer compositions on the growth and yield of five micropropagated pineapple cultivars. The study was started in a greenhouse and at 210 days after transplanting, the seedlings were transferred to field conditions. The experimental design was in randomized blocks, in subdivided plots with three factors and four replications. The combination of the five pineapple cultivars (BRS Ajubá, IAC Fantástico, BRS Imperial, Pérola and BRS Vitória) and three leaf fertilizer compositions (NK, NPK and NPK + micronutrients) were randomized in plots and six evaluation periods consisted of subplots. Agronomic attributes were analyzed at the time of evaluation. The results obtained were subjected to analysis of variance by the F test. The Scott-Knott test was used for comparisons between cultivars and fertilization, and regression for the seasons, using the SISVAR program. Regardless of fertilization, cv. IAC Fantástico stood out in the majority of the evaluated characters, being superior to cv. Pérola, considered standard. The NK formula shows to be the best option for use as leaf fertilizer in the pineapple crop. The cultivar IAC Fantástico has good vegetative and productive characteristics, having the potential to be a viable option for cultivation in the state of Roraima.

Keywords : Ananas comosus; Foliar fertilization; plant micropropagation; fruit nutrition.

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