Coffee Science
URI permanente desta seção${dspace.url}/handle/123456789/3355
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Item New orthotropic stems induction in arabica coffee by pruning and biostimulant application(Editora UFLA, 2024-11-11) Honda Filho, Cássio Pereira; Coelho, Larissa Sousa; Andrade, Otavio Vitor Souza; Godinho, Emmanuel ZulloPruning are techniques used to renew a coffee tree and promote the growth of a more vigorous plant. Allied to that, the use of biostimulants can help the boost growth and development of the new produced stems. The objective of the present work was to evaluate whether the presence of plagiotropic branches in coffee trees pruned by low pruning and the application of biostimulant would influence the production, growth and vigor of new orthotopic branches in Coffea arabica. The experiment consisted of 10 treatments, arranged in a randomized block design with a 2x5 factorial: two pruning methods (low pruning with and without plagiotropic branches) and five doses of Stimulate® (0, 100, 200, 400 and 800 mL). The traits evaluated were vigor of the orthotropic branches produced vigor, orthotropic branches length, number of orthotropic branches orthotropic and orthotropic branches diameter. The use of low pruning with remaining plagiotropic stems combined with the use of biostimulants at a dose of 400 mL induces the production of vigorous orthotropic stems in Arabica coffee trees.Item Rooting biostimulants for Coffea arabica L. cuttings(Editora UFLA, 2020) Azevedo, Harianna Paula Alves de; Carvalho, Alex Mendonça de; Vidal, Douglas Alves; Santos, Heloisa Oliveira dos; Doria, JoyceIn the rooting process of Arabica coffee cuttings, plant hormones are used for inducing root formation. However, synthetic molecules cannot be used to form organic seedlings. The objective of this work was to evaluate the effect Cyperus haspan extract and different concentrations and types of humic substances on Arabica coffee cuttings. Arabica coffee shoots were collected, and cuttings containing at least two buds were taken. The experiment had a three-factor design, 2 (presence or absence Cyperus haspan extract) x 2 (humic or fulvic acid) x 4 (0, 10, 25 and 50 mg dm-³ concentrations). The following vegetative data were evaluated: shoot height (cm), survival, remaining leaves, leaf pairs, vigor, number of shoots,root length, area root, volume root, diameter root and fresh and dry mass were also evaluated. The enzyme activity of H+-ATPase, catalase, superoxide dismutase, alcohol dehydrogenase and esterase was also quantified. The results showed that the Arabica coffee cutting rooting rate was increased when treated with humic acid at a concentration of 10 mg dm-³ in the presence of Cyperus haspan extract. The lowest oxidative stress was observed in the 10 mg.dm-³ humic and fulvic acid treatments, regardless of the use of the extract.