ISHS Acta Horticulturae 822: VI International Pineapple Symposium
GROWTH OF MICROPROPAGATED ANANAS COMOSUS VAR. ERECTIFOLIUS PLANTLETS IN DIFFERENT SUBSTRATES UNDER SCREENHOUSE CONDITIONS |
| Authors: | D. Correia, M.V.P. Rocha, G.C. Alvez |
| Keywords: | ornamental pineapple, vermiculite, fertilization, coconut mesocarp dust |
| Abstract:
Ceará State is the first ranked national exporter of ornamental pineapple plants as cut flowers, which are mainly sent to the Netherlands, the United States, Germany, Portugal, Denmark and France. Ornamental pineapple crops are present in several states of the Brazilian Northeast, as well as in the States of Goias and Tocatins. The micropropagation technique has helped to multiply plants with better uniformity and phytosanitary quality. These characteristics, as well as the use of adequate substrates contribute to plantlet growth in nursery and to reduce losses during field establishment. The aim of this work was to evaluate nursery growth of micropropagated ornamental pineapple plantlets in different substrates. Plantlets with a height between 3 cm and 5 cm and cylindrical containers (capacity 120 cm3) were used in this experiment carried out under screenhouse conditions with 50% of shading. The experimental design was in completely randomized blocks with six treatments, four replications and 18 plantlets per plot, with a factorial scheme of 3 (substrates) x 2 (presence or absence of fertilizer). The following substrates were used: carbonized rice husk (50%) and vermicompost (20%) with 30% of the following components: (S1) – ripe coconut mesocarp dust; (S2) – Plantagro®; (S3) – vermiculite. Each substrate was supplemented with or without slow liberation fertilizer (Polyon 14:14:14 – 3,6 kg/m3). After a 120-day experimental period, the following was observed: a) average leaf number was larger in substrates supplemented with fertilizer than in its absence; b) larger root and shoot dry mass were achieved in S2 and S3 with fertilizer; c) easier plantlet withdrawing from the container was observed for S2 and d) the best root aggregation to the substrates occurred in S3 and S2. | |
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