AGROQUÍMICOS E LESÕES EM ESTACAS DE CAULE NA FORMAÇÃO DE MUDAS DE UMBU-CAJAZEIRA

Nouglas Veloso Barbosa Mendes; Francisco Xavier de Souza; Adroaldo Guimarães Rossetti; William Natale; Márcio Cleber de Medeiros Corrêa

doi:10.1590/1983-21252019v32n427rc

Authors

Nouglas Veloso Barbosa Mendes Department of Plant Sciense, Universidade Federal do Ceará, Fortaleza, CE https://orcid.org/0000-0003-4873-3206
Francisco Xavier de Souza Research and Development, Embrapa Agroindústria Tropical, Fortaleza, CE https://orcid.org/0000-0002-7677-346X
Adroaldo Guimarães Rossetti Research and Development, Embrapa Agroindústria Tropical, Fortaleza, CE https://orcid.org/0000-0002-0150-4089
William Natale Department of Plant Sciense, Universidade Federal do Ceará, Fortaleza, CE https://orcid.org/0000-0001-9572-4463
Márcio Cleber de Medeiros Corrêa Department of Plant Sciense, Universidade Federal do Ceará, Fortaleza, CE https://orcid.org/0000-0002-0702-4959

DOI:

https://doi.org/10.1590/1983-21252019v32n427rc

Keywords:

Vegetative propagation. Cutting. Spondias.

Abstract

Umbu-caja (Spondias sp.) is a fruit tree native to the Northeast region of Brazil, which is grown because of its highly valuable fruits for fruit processing industries. The objective of this work was to evaluate the effect of agrochemical applications and cutting types on the rooting and development of Spondias sp. plantlets. The experiment was conducted at the experimental field of the Embrapa Tropical Agroindustry, in Pacajus, CE, Brazil. A randomize block experimental design was used, with five treatments - control (T1); cuttings with two lesions at the base (CL) + rooting gel (RG) (Sela Gel^®) (T2); CL + rooting fertilizer (RF) (Radimax^®) (T3); cuttings with two transversal cross sections at the base (CS) + RG (T4); and CS + RF (T5). The environments (blocks) used were: full sun; 100% shade ceiling; 50% shade walls and ceiling; and 50% shade ceiling. The plots consisted of eight cuttings, totaling 160 cuttings. Propagules were taken from Spondias sp. plants to make woody cuttings with length of 25 cm, diameter of 29.7 mm, and mean bud per cutting of 8.7. All cuttings were immediately treated with a 0.05% sodium hypochlorite solution for four minutes before making the lesions and transversal cross sections and applying the treatments. The RG was applied by brushstroke, and the RF was applied by immersion in an aqueous solution of 10 mL L^-1 for 10 minutes. The cuttings were planted into 6-liter black plastic pots filled with a pasteurized mixture of vermiculite, coconut husk powder, ground leaf fibers of Copernicia prunifera, and carbonized rice husk (2:1:1:1; v v^-1). The treatments and blocks significantly affected the rooting and development of cuttings. The treatment with CS and application of the RG (T4) promoted root callus formation, rooting, and vigorous development of plantlets, whereas the RF (T3 and T5) failed to promote root formation.

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